Lenovo Legion 9i (18″, Gen 10) review – RTX 5090 Power & Forged Carbon
The Lenovo Legion 9i (18″, Gen 10) isn’t just a laptop; it’s a flex. From its mesmerizing forged carbon lid to its staggering spec sheet featuring an RTX 5090 and Thunderbolt 5, this machine is designed to dominate every conversation and every benchmark. It represents the absolute pinnacle of Lenovo’s engineering, cramming workstation-level upgradeability, including four RAM slots and four SSD bays, into a chassis that feels more like a luxury hypercar than a computer. But does this opulent display of technology translate into a superior gaming experience, or is it just expensive overkill? We put this titan to the test to find out.
You can check the prices and configurations in our Specs System: https://laptopmedia.com/series/lenovo-legion-9i-18-gen-10/
Contents
Specs, Drivers, What’s in the box
Lenovo Legion 9i (18", Gen 10) - Specs
- HDD/SSD
- up to 8000GB SSD
- M.2 Slot
- 1x 2280 M.2 NVMe PCIe 5.0 x4 + 3x 2280 M.2 NVMe PCIe 4.0 x4 See photo
- RAM
- up to 192GB
- OS
- Windows 11 Pro, Windows 11 Home, No OS
- Battery
- 99.9Wh
- Body material
- Aluminum, Carbon
- Dimensions
- 403 x 296.9 x 23.9 - 27.95 mm (15.87" x 11.69" x 0.94")
- Weight
- 3.50 kg (7.7 lbs)
- Ports and connectivity
- 2x USB Type-A
- 3.2 Gen 2 (10 Gbps)
- 1x USB Type-A
- 3.2 Gen 2 (10 Gbps), Sleep and Charge
- 1x USB Type-C
- 3.2 Gen 2 (10 Gbps)
- 2x USB Type-C
- 4.0, Thunderbolt 5, Power Delivery (PD), DisplayPort
- HDMI
- 2.1 (8K@60Hz)
- Card reader
- SD (SD, SDHC, SDXC)
- Ethernet LAN
- 10, 100, 1000, 2500 Mbit/s
- Wi-Fi
- Wi-Fi 7
- Bluetooth
- 5.4
- Audio jack
- 3.5mm Combo Jack
- Features
- Fingerprint reader
- Web camera
- 5.0MP + 3D IR, with E-shutter, fixed focus
- Backlit keyboard
- Microphone
- Dual-microphone array
- Speakers
- 6 stereo speakers, 2W x4 (woofers), 2W x2 (tweeters), optimized with Nahimic Audio, Smart Amplifier (AMP)
- Security Lock slot
All Lenovo Legion 9i (18″, Gen 10) configurations
Drivers
All drivers and utilities for this notebook can be found here: https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/legion-series/legion-9-18iax10/downloads
What’s in the box?
Lenovo keeps the focus squarely on the formidable hardware with the unboxing of the Legion 9i (18″, Gen 10).
Inside, you’ll find just two items: the beastly laptop itself and the equally impressive 400W slim-tip AC adapter required to power it.
There are no extra accessories, just the pure essentials for unleashing this machine’s performance.
Design and construction
The Lenovo Legion 9i (18″, Gen 10) is not just a laptop; it’s a statement piece of titanic luxury. From the moment you lay eyes on it, the forged carbon lid, created by fusing eight distinct layers of carbon fibre, is utterly mesmerizing. Each unit has a unique pattern, lending it a bespoke quality.
In its powered-off state, the “Eclipse Black” chassis (the only colour available, and it’s perfect) is the epitome of stealthy style. But press the power button, and a U-shaped RGB light strip erupts, transforming the machine from a sophisticated monolith into an all-out gaming spectacle. The build quality is, without exaggeration, among the most robust we have ever tested. The combination of forged carbon and aluminium results in a chassis that simply does not move, even under significant pressure. It feels like it was machined from a single, solid block, and we have no doubt it passed its MIL-STD durability tests with flying colours.
This is a substantial machine, and it makes no apologies for it. Measuring 403 x 296.9 x 23.9-27.95 mm (15.87 x 11.69 x 0.94-1.10 inches), it commands a significant desk presence. The weight further reinforces its powerhouse status, starting at 3.5 kg (7.72 lbs) for models with a 2D display and climbing to 3.75 kg (8.27 lbs) for the 3D display variant. The effort required to lift the lid feels like a demonstration of the system’s incredible structural integrity; it’s a two-handed operation that feels purposeful and solid. In terms of cleanliness, the unique forged carbon lid does an excellent job of resisting fingerprints, but the smooth aluminium palm rest does tend to pick up some smudges over time.
Once open, the massive 18-inch display is framed by impressively thin bezels, achieving a high 93.1% screen-to-body ratio. The side and top bezels measure just 6 mm (approximately 0.24 inches), with a small central “bump” on the top bezel extending to 11 mm (approximately 0.43 inches). This bump provides the necessary space for a dual-microphone array and a high-quality 5.0MP + IR camera, which comes with an E-shutter for privacy and is even available in a 3D version on some configurations.
The hinge is another engineering highlight, allowing the screen to open a full 180 degrees to lay completely flat – a nice touch of flexibility, even though there are no touchscreen options.
The keyboard deck is a comfortable and well-appointed space. Given the 18-inch chassis, the inclusion of a NumPad is a welcome sight. Its keys are slightly smaller than the main set, a compromise made to accommodate the side-firing speakers, but they remain perfectly usable. The keyboard itself is a classic Legion experience, offering a comfortable 1.6mm of key travel, a 0.3mm keycap recess, and brilliant per-key RGB backlighting.
For biometric login, there is no fingerprint reader, but the IR camera provides fast and reliable access via Windows Hello. Below the keyboard lies an absolutely enormous trackpad, measuring a vast 150 x 95 mm (approximately 5.91 x 3.74 inches). Its huge surface area is both precise and very comfortable to use, providing a fantastic navigation experience when you’re not in the heat of battle with a dedicated mouse.
Ports and Connectivity
The Lenovo Legion 9i (18″, Gen 10) is exceptionally well-equipped with a vast and high-performance array of ports distributed across its chassis. On the left side, it features a high-speed USB-A port operating at 10Gbps, which includes an ‘Always On’ capability for charging peripherals even when the laptop is off. For networking, it boasts a 2.5GbE Intel Killer E3100G Ethernet port, providing faster-than-Gigabit wired speeds ideal for gaming and large downloads. The main highlight here is the pair of cutting-edge Thunderbolt 5 ports. These offer staggering data speeds up to 80Gbps, support the latest DisplayPort 2.1 standard for video output, and feature a powerful 140W Power Delivery 3.0 capability. A standard headphone/microphone combo jack is also present.
The right flank continues to impress with its generous connectivity. It houses two additional high-speed USB-A ports, both running at a 10Gbps transfer rate, bringing the total of fast Type-A ports to three. A significant boon for content creators is the inclusion of a full-sized SD Card Reader 4.0, offering excellent transfer speeds for professional media workflows. There’s also an additional USB-C port (10Gbps) for even more modern peripheral support. A physical E-shutter button provides a convenient and instant way to ensure webcam privacy.
To help with cable management and maintain a clean desk setup, the least-frequently accessed ports are located on the rear of the chassis. This includes the main DC-in power connector and a powerful HDMI 2.1 port, which is capable of driving external displays at resolutions up to 8K at 60Hz.
Wireless connectivity is equally top-tier. The Legion 9i is equipped with an Intel Killer Wi-Fi 7 BE1750x module. This supports the latest 802.11be standard with a 2×2 antenna configuration, ensuring access to the fastest possible wireless speeds, lower latency, and improved performance on compatible networks. This is paired with Bluetooth 5.4 for robust and efficient connection to all modern wireless accessories.
– Wi-Fi 7 vs Wi-Fi 6E: Learn the Key Differences in 10 Seconds
Display and Sound Quality, Display Profiles
We ordered the Legion 9i with the standard 18-inch 4K WQUXGA (3840 × 2400) IPS display that runs at up to 240 Hz in 2D. In this mode, you can also drop the resolution to 1920 × 1200 to reach up to 440 Hz for ultra-fast gameplay. If you want the most advanced configuration, Lenovo also offers Legion 9i variants with a glassless 2D/3D version of the same 18-inch panel, combining 4K 240 Hz 2D with a 1920 × 1200 3D mode and the same 440 Hz 2D option at the lower resolution.
| Lenovo Legion 9i (18″, Gen 10 / 18IAX10) | 18″, WQUXGA (3840 x 2400), up to 240 Hz, IPS (2D-only) | 18″, WQUXGA (3840 x 2400), up to 240 Hz / 1920 x 1200 up to 440 Hz, IPS with 2D/3D mode |
| Diagonal | 18.0 inches (45.7 cm) | 18.0 inches (45.7 cm) |
| Panel Type | IPS | IPS with glassless 2D/3D |
| Resolution | 3840 x 2400 pixels (4K) | 3840 x 2400 pixels (4K 2D) / 1920 x 1200 pixels (2D/3D mode) |
| Max Refresh Rate | Up to 240 Hz at 3840 x 2400 | Up to 240 Hz at 3840 x 2400, or up to 440 Hz at 1920 x 1200 (2D) |
| Aspect Ratio | 16:10 | 16:10 |
| Pixel Density | 251 PPI | 251 PPI (4K 2D mode) |
| ‘Retina’ Distance | Greater than or equal to 35 cm | Greater than or equal to 35 cm (4K 2D mode) |
The 2400p / 240 Hz / 2D panel under our microscope
Viewing Angles
Viewing angles are good. We take photos from different angles to evaluate the quality.
Also, a video with locked focus and exposure.
Color Coverage
The whole “sail-shaped” map below (Fig. 1) consists of all the colors we can see, while the black crooked line shows all the colors from real-world scenes and nature around us.
Then, we’ve drawn some of the most important and interesting color spaces, compared to the colors the panel of Lenovo Legion 9i (18″, Gen 10 / 18IAX10) can show:
Standard/For Web: sRGB – widely used color space for most consumer devices, ideal for Web design and development
For Print: AdobeRGB – used in professional photo editing, graphic design, and print
For Photographers/Video Editors: DCI-P3 – used in high-end film production, post-production, and digital cinema
Premium HDR: Rec.2020 – the widest consumer ITU color standard, covering a massive 75.8% of the visible spectrum, a benchmark for premium HDR content
Lenovo Legion 9i (18″, Gen 10 / 18IAX10): the yellow dashed triangle (– – – – – –) represents the range of colors this monitor can show.
In our tests, we calculated the total color coverage of the display at 100% of the sRGB color gamut and 97% of the DCI-P3 color gamut.
(Fig.1) Lenovo Legion 9i (18″, Gen 10 / 18IAX10) covers 97% of the DCI-P3 gamut
Brightness and Contrast
The maximum brightness in SDR mode is 501 cd/m² in the center of the screen and 482 cd/m² averaged across the surface with a maximum deviation of 9%.
The maximum brightness in HDR mode is 501 cd/m² at 8% white fill and 503 cd/m² on a full white screen.
The correlated color temperature (CCT) of a white screen at maximum brightness is 7040 K.
The contrast ratio is 1280:1.
Uniformity: Luminance, Contrast, and Color Deviation
The figure below shows the results from our uniformity test across different sections of the screen. It’s measured at 182 nits (Windows slider = 62%) — a brightness level we consider typical for standard working conditions.
DeltaE values below 4.0 are acceptable for regular users. For those working with colors, screens with DeltaE values no higher than 2.0 are recommended.
Color Accuracy
Let’s check the difference between real colors and those you’ll see on the Lenovo Legion 9i (18″, Gen 10 / 18IAX10). We measure that distance in DeltaE – the higher the number, the more different they look.
Values below 4.0 are acceptable for regular users, while values below 2.0 are suitable for color-sensitive work. A value below 1.0 means the difference is indistinguishable to the naked eye.
For the next graph, we’ve selected 24 common colors, including dark/light skin, blue sky, green grass, etc.
Before our calibration of the Lenovo Legion 9i (18″, Gen 10 / 18IAX10), the Average color accuracy was 2.3 dE (Fig. 2) and with our Design and Gaming profile, it lowered to 1.2 dE (Fig. 3). This makes the display excellent for serious, professional work!
Lenovo Legion 9i (18″, Gen 10 / 18IAX10) in its factory condition
Lenovo Legion 9i (18″, Gen 10 / 18IAX10) with our display profile
Comparison in the Display P3 color space.
Here’s an illustration of what the Design and Office profile aims to deliver:
Left: No Profile | Drag the slider to see the difference | Right: Design & Office Profile
Visibility in dark scenes
Have you ever watched a movie with dark scenes where you could barely see anything? This often happens because many display panels struggle to differentiate the darkest nuances, making them appear the same.
The next figure illustrates how well the display reproduces these dark nuances. The left side of the image shows the display with stock settings, and the right side shows it with our Gaming and movies profile activated.
On the horizontal axis are the grayscale levels, and on the vertical axis – the corresponding display brightness.
You can also check how your display handles the darkest nuances but keep in mind that this also depends on the settings of your current display and the surrounding light conditions.
Response time (Gaming capabilities)
We test the reaction time of the pixels with the usual “black-to-white” and “white-to-black” method from 10% to 90% and vice versa.
We recorded Fall Time + Rise Time = 7.0 ms. Short pixel response time is a prerequisite for a smooth picture in dynamic scenes.
After that, we test the reaction time of the pixels with the usual “Gray-to-Gray” method from 50% White to 80% White and vice versa between 10% and 90% of the amplitude.
Health Impact: PWM (Screen flickering)
Some use PWM to regulate their brightness, which means that instead of reducing the light intensity, they pulse or flicker. Our brain merges the image, so it appears darker, but this strains both it and our vision, especially when the frequency of the pulses is low. You can read more about that in our dedicated article on PWM.
In the graph below, you see the intensity of light at different brightness levels—on the vertical axis is the brightness of the emitted light, and on the horizontal axis—time.
The light from the backlight of the Lenovo Legion 9i (18″, Gen 10 / 18IAX10) display is not pulse-width modulated, providing visual comfort in the discussed aspect.
Health Impact: Blue light emissions
Installing our Health-Guard profile reduces harmful Blue Light emissions while keeping the colors of the screen perceptually accurate.
If you’re not familiar with the Blue light, the TL;DR version is – emissions that negatively affect your eyes, skin, and your whole body. You can find more information about that in our dedicated article on Blue Light.
Health Impact: Screen Reflectance
Glossy-coated displays can cause eye fatigue in high ambient light conditions due to reflections. We measure the level of screen reflection with the display turned off, at a 60° angle.
The reflectance of the Lenovo Legion 9i (18″, Gen 10 / 18IAX10)’s screen is 100 GU. This is a mediocre result, more typical for OLED panels.
High Gloss: >70 GU
Medium Gloss: 30 – 70 GU
Low Gloss: <30 GU
Get our profiles
Since our profiles are tailored for each individual display model, this article and its respective profile package are meant for Lenovo Legion 9i (18″, Gen 10 / 18IAX10) configurations with NE180QAM-NZ2 (BOE0D5B), 2560 х 1600, IPS panel.
*Should you have problems with downloading the purchased file, try using a different browser to open the link you’ll receive via e-mail. If the download target is a .php file instead of an archive, change the file extension to .zip or contact us at [email protected].
Read more about the profiles HERE.
In addition to receiving efficient and health-friendly profiles, by buying LaptopMedia's products you also support the development of our labs, where we test devices in order to produce the most objective reviews possible.
Design and Office
The Design and Office profile makes display colors as close to real as possible.Ideal not only for professionals but also for everyday users, it meets sRGB standards (D65 white point, sRGB gamma) with minimal DeltaE for precise color reproduction on your panel.
Gaming and Movies
Have you ever watched a movie where, during dark scenes, you can barely see anything? Many displays fail to distinguish dark tones properly. Our Gaming and Movies profile enhances low-light performance, like HDR tech, using a gamma curve tailored to human perception — ideal for gamers seeking faster reactions and clearer visuals.
Health-Guard
Our Health-Guard profile protects your eyes by eliminating PWM flickering, reducing strain and fatigue, and minimizing harmful Blue light exposure that can disrupt sleep and health. It uses software dimming and a gamma curve tailored to human perception for comfort and safety during screen use.
Get All The Profiles With 33% Discount!
Sound
The Lenovo Legion 9i (18″, Gen 10 / 18IAX10)’s sound is of very good quality (6-speaker system). The low, mid, and high frequencies are clear.
Work Performance: CPU, Storage, AI
All performance and temperature tests are conducted with “Performance” mode activated in Legion Space with GPU OC Enabled, and in dGPU working mode:
CPU and Work Performance
The Lenovo Legion 9i (18″, Gen 10 / 18IAX10) comes equipped with the Intel Core Ultra 9 275HX – an Arrow Lake-HX powerhouse that ranks #5 in our Top Laptop CPU Ranking. Featuring 24 cores (8 performance and 16 efficiency), boost clocks reaching up to 5.4 GHz on performance cores, and a robust AI-Boost NPU, this chip delivers desktop-class multi-core performance well-suited for game development, 3D rendering, and demanding workflows.
Intel Core Ultra 9 275HX in Legion 9i is the fastest 275HX we’ve tested! The secret? You’ll find it a bit down in the review.
Single-core performance ensures smooth operation and responsiveness in operating systems, providing a better user experience.
Results are from the Geekbench 6 Single-Core test (higher is better)
Multi-core performance is essential for handling complex and demanding tasks, such as Video editing, CAD, and Scientific simulations.
Results are from the Geekbench 6 Multi-Core test (higher is better)
Here, we evaluate the CPU's performance using a real-world 3D rendering task, assessing its ability to handle complex computations and rendering workloads efficiently.
Results are from the Cinebench 2024 Multi-Core test (higher is better)
Storage Performance
We ordered a 2TB storage variant of Legion 9i and it arrived with Samsung MZVLC2T0HBLD-00BL2 PCIe 5.0 x4 NVMe drive. It’s blazing fast with 12.4GB/sec sequential read, and 13.2GB/sec sequential write speeds. The max temperatures are good.
AI Performance
Here you can see the position of the GPUs and CPUs (NPUs) found within the Lenovo Legion 9i (18", Gen 10) in our AI Hardware Performance Rankings based on their AI processing power, measured in TOPS (Tera Operations Per Second) - a critical metric indicating the computational throughput, particularly for AI tasks.
The first column shows peak performance for INT8/FP8 precision, which is the most widespread metric for evaluating AI inference capabilities. We exclude Sparsity to provide a more accurate reflection of AI performance in dense computation scenarios where sparsity optimizations may not be applicable. The second and third columns show the performance with Sparsity, and FP4 TFLOPS, when supported.
For SoCs, the results reflect the peak performance of the integrated NPU. Additionally, it’s important to note that, according to Microsoft, a NPU must have at least 40 TOPS of AI computing power for the PC to be considered “AI-capable.”
| # | GPU / CPU (NPU) | TOPS INT8/FP8 No Sparsity | TOPS INT8/FP8 Sparsity | TFLOPS FP4 Sparsity |
|---|---|---|---|---|
| 172. | NVIDIA GeForce RTX 5090 (Laptop) | 363 | 726 | 1452 |
| 416. | NVIDIA GeForce RTX 5080 (Laptop) | 281 | 562 | 1124 |
| 1739. | Intel Core Ultra 9 275HX | 13 | — | — |
GPU and Gaming Performance
Graphics options are likewise top-tier, ranging from the NVIDIA GeForce RTX 5090 (Laptop) – the highest-ranked GPU in our Top Laptop Graphics Ranking, down to the RTX 5080 (Laptop), which holds the #2 spot, offering extraordinary ray tracing, DLSS, and AI-accelerated performance.
We’ve got 7 laptops with RTX 5090. And Lenovo Legion 9i is the most powerful of them all! 10% faster than MSI’s flagship Titan 18 HX AI! Incredible work by Lenovo!
The results are from 3DMark Time Spy (Graphics). Higher is better.
The results are from 3DMark Wild Life Extreme Unlimited. Higher is better.
Gaming tests
The Lenovo Legion 9i is an absolute esports titan. Leveraging its unique dual-mode display, it achieves a staggering 385 FPS at 1200p (for the 440Hz mode) and an incredible 167 FPS at the native 2400p (240Hz mode), both on Very High settings. This is peak performance for competitive gaming.
| Counter Strike 2 | 1200p, Very High (Check settings) | 2400p, Very High (Check settings) |
| Average FPS | 385 FPS | 167 FPS |
In the visually demanding Black Myth: Wukong at the native 2400p resolution, the Legion 9i delivers a very smooth 90 FPS on High settings. The ultra-taxing Cinematic preset yields 33 FPS, which is a good starting point for enabling DLSS to achieve higher frame rates at maximum fidelity.
| Black Myth: Wukong | 2400p, High (Check settings) | 2400p, Cinematic (Check settings) |
| Average FPS | 90 FPS | 33 FPS |
This flagship laptop demolishes Shadow of the Tomb Raider on the Highest preset. It pushes an amazing 213 FPS at 1200p for ultra-high-refresh gaming and a very fluid 77 FPS at the sharp 2400p native resolution, ensuring a premium single-player experience.
| Shadow of the Tomb Raider | 1200p, Highest (Check settings) | 2400p, Highest (Check settings) |
| Average FPS | 213 FPS | 77 FPS |
The ray-tracing prowess of the RTX 5090 is on full display in Metro Exodus Enhanced Edition. The Legion 9i achieves a blistering 101 FPS at 1200p on the brutal Extreme preset. At 2400p on the same settings, it maintains a playable 43 FPS, which is very impressive for such a demanding workload.
| Metro Exodus Enhanced Edition | 1200p, Extreme (Check settings) | 2400p, Extreme (Check settings) |
| Average FPS | 101 FPS | 43 FPS |
Temperatures and Comfort, Noise, Stability
At idle, the CPU package of Lenovo Legion 9i maintains a temperature of 45ºC, and the notebook remains completely silent.
Office Work, Web Development, Design
Short periods (0:00 – 0:10 s) of 100 % CPU load
This test shows the CPU behavior during short periods of serious load. It’s important for users who are looking for laptops suitable for tasks like Web Design and Programming.
| Intel Core Ultra 9 275HX | Avg. P-Core Clock | Avg. CPU Temp. | Avg. CPU Power |
| Lenovo Legion 9i (18″, Gen 10 / 18IAX10) | 4850 MHz | 89 °C | 175 W |
| MSI Vector 17 HX AI A2XW | 4496 MHz | 81 °C | 120 W |
| ASUS ROG Strix G18 G815 (2025) | 4480 MHz | 78 °C | 123 W |
| ASUS ROG Strix G16 G615 | 4471 MHz | 94 °C | 150 W |
| ASUS ROG Strix SCAR 18 G835 (2025) | 4399 MHz | 90 °C | 117 W |
| Acer Predator Helios 16 AI (PH16-73) | 4374 MHz | 87 °C | 154 W |
| Lenovo Legion Pro 7i Gen 10 (16″ Intel) | 4268 MHz | 90 °C | 167 W |
| Acer Predator Helios Neo 16 AI (PHN16-73) | 4194 MHz | 91 °C | 151 W |
| MSI Vector 16 HX AI A2XW | 4185 MHz | 90 °C | 155 W |
| Lenovo Legion 7i (16”, Gen 10 / 16IAX10) | 4142 MHz | 94 °C | 118 W |
| Acer Predator Helios Neo 16S AI (PHN16S-71) | 3829 MHz | 88 °C | 130 W |
The Lenovo Legion 9i demonstrates exceptional performance during short, intense CPU loads, achieving an average clock speed of 4850 MHz over the initial 10 seconds. This is the highest among compared laptops, with a peak clock of 5034 MHz. The CPU operates at a high average power of 175 W, consistently delivering top-tier performance. While the average CPU temperature of 89 °C is acceptable, it reaches a high peak of 105 °C. Despite the peak temperature, the Legion 9i’s superior clock speeds position it as a leader for tasks requiring immediate, high-burst processing, outperforming all rivals in raw clock performance for short durations.
Video editing, Scientific computing, Software compilation, 3D rendering
Long periods (0:00 – 30:00 min) of 100 % CPU load
This test shows the CPU behavior during long periods of serious load. It’s important for users who are looking for laptops suitable for tasks like Video Editing and 3D Rendering.
| Intel Core Ultra 9 275HX | Avg. P-Core Clock | Avg. CPU Temp. | Avg. CPU Power |
| Lenovo Legion 9i (18″, Gen 10 / 18IAX10) | 4576 MHz | 101 °C | 171 W |
| ASUS ROG Strix G18 G815 (2025) | 4377 MHz | 90 °C | 144 W |
| ASUS ROG Strix G16 G615 | 4178 MHz | 97 °C | 134 W |
| Acer Predator Helios 16 AI (PH16-73) | 4106 MHz | 92 °C | 140 W |
| ASUS ROG Strix SCAR 18 G835 (2025) | 4058 MHz | 95 °C | 130 W |
| MSI Vector 17 HX AI A2XW | 4007 MHz | 87 °C | 111 W |
| Lenovo Legion Pro 7i Gen 10 (16″ Intel) | 3981 MHz | 91 °C | 151 W |
| Acer Predator Helios Neo 16 AI (PHN16-73) | 3945 MHz | 91 °C | 130 W |
| MSI Vector 16 HX AI A2XW | 3903 MHz | 84 °C | 111 W |
| Lenovo Legion 7i (16”, Gen 10 / 16IAX10) | 3785 MHz | 89 °C | 96 W |
| Acer Predator Helios Neo 16S AI (PHN16S-71) | 3362 MHz | 85 °C | 86 W |
For sustained, long-duration CPU tasks, the Lenovo Legion 9i delivers top-tier performance, averaging an impressive 4576 MHz over 30 minutes. This clock speed surpasses all comparable Intel Core Ultra 9 275HX systems. The CPU maintains a high average power of 171 W, indicating robust power delivery. However, this sustained performance results in a high average CPU temperature of 101 °C, exceeding the acceptable range. While it leads in raw clock speed for extended loads, the elevated temperature suggests the system is pushed to its thermal limits, differentiating it from competitors like the ASUS ROG Strix G18 G815 which maintains 4377 MHz at 90 °C.
Gaming Stability
Continuous gaming (1-hour test)
This test evaluates the laptop’s performance under sustained GPU load and high CPU usage.
| NVIDIA GeForce RTX 5090 | Avg. GPU Clock | Avg. GPU Temp. | Avg. Memory Clock | Avg. GPU Mem Temp. | Avg. GPU Power |
| Lenovo Legion Pro 7i Gen 10 (16″ Intel) | 2238 MHz | 79 °C | 1463 MHz | 78 °C | 171 W |
| Lenovo Legion 9i (18″, Gen 10 / 18IAX10) | 2233 MHz | 68 °C | 1412 MHz | 63 °C | 164 W |
| MSI Vector 17 HX AI A2XW | 2128 MHz | 79 °C | 1381 MHz | 75 °C | 172 W |
| MSI Titan 18 HX A2XW | 2079 MHz | 83 °C | 1749 MHz | 81 °C | 172 W |
| Acer Predator Helios 16 AI (PH16-73) | 2053 MHz | 85 °C | 1626 MHz | 79 °C | 163 W |
| MSI Raider A18 HX (A9Wx) | 2046 MHz | 78 °C | 2313 MHz | 75 °C | 161 W |
| ASUS ROG Strix SCAR 18 G835 (2025) | 1959 MHz | 73 °C | 2350 MHz | 72 °C | 159 W |
The Lenovo Legion 9i demonstrates outstanding gaming stability and thermal management for its RTX 5090 GPU over a 60-minute test. It maintains a strong average GPU clock of 2233 MHz, closely matching the leading competitor (Legion Pro 7i). Crucially, its average core temperature is a remarkably low 68 °C, with a peak of only 70 °C, well within the good range. GPU memory temperatures are equally impressive at an average of 63 °C and a peak of 66 °C. These metrics indicate excellent cooling efficiency, allowing the GPU to sustain high clocks with exceptional thermal headroom compared to other RTX 5090 laptops, which often run warmer.
Battery Life
The battery of the Lenovo Legion 9i (18″, Gen 10 / 18IAX10) is a lithium-polymer, model L24M4PC1. Its nominal voltage is 15.52V and stores 99.9 Wh of electrical energy.
For our battery life test we used the Quiet preset in Legion Space, with Hybrid GPU mode.
4 hours and 15 minutes on a single charge is a very good result for a super powerful 18-incher.
Brightness: 180 nits; Display Mode: SDR
Time to Full Discharge: Higher is Better
Disassembly, Upgrade options, and Maintenance
Removing the bottom panel reveals a clean, dense layout centered around high airflow and straightforward access to key components. The motherboard is flanked by large fan housings and a full-width shroud, with clearly labeled service points for memory and storage. Once inside, the platform feels enthusiast-focused rather than sealed-up.
The cooling solution is serious for a portable system: four fans feed a massive vapor chamber that spans both the CPU and GPU, while additional plates and thermal pads draw heat away from the VRAM and the SSD area. The arrangement prioritizes sustained performance, and the dedicated SSD heatsinks should help keep drive throttling in check during long transfers.
Memory is fully socketed with four DDR5 SO-DIMM slots arranged for dual-channel operation. Lenovo lists support for up to 192GB, and the slot priority is printed on the deck (A2/B2 first for two-module configurations). Our configuration arrives with 64GB installed as two 32GB modules, leaving two slots open for future expansion.
Storage options are equally generous: there are four M.2 2280 slots in total, one wired for PCIe 5.0 x4 and three for PCIe 4.0 x4. Lenovo rates up to 2TB per slot, RAID is supported, and the area is covered with heatspreaders and pads.
Our unit uses a Samsung PM9E1 2TB drive in the PCIe 5.0 primary bay, while the three PCIe 4.0 bays remain free for additional capacity.
Wireless is handled by a replaceable Intel Killer Wi-Fi 7 BE1750x (2×2) card with Bluetooth 5.4 in an M.2 slot. The antennas are easy to trace and the module itself is secured with a single screw, making future swaps straightforward if standards evolve.
The battery is a 99.9Wh pack secured with screws and a single board-side connector, and it supports Lenovo’s Super Rapid Charge (claimed 0–30% in 10 minutes, 0–70% in 30 minutes). The pack lifts cleanly once fasteners are out; there is no adhesive under the cells, so replacements are routine as long as the cable is handled carefully.
Beyond RAM, SSDs, and the Wi-Fi module, several parts are serviceable: the four fans are screw-mounted and removable, and the bottom cover uses standard fasteners. The CPU, GPU, and VRAM remain board-level components and are not intended to be replaced by the user.
Verdict
The Lenovo Legion 9i (18″, Gen 10) is a tour de force, a machine that redefines the upper limits of what a gaming laptop can be. It is an unapologetic, ultra-premium powerhouse that combines exotic materials, cutting-edge engineering, and sheer brute force into a package that is as stunning to look at as it is to use. This is not just a computer; it’s a showcase of the absolute best technology currently available, designed for the enthusiast who demands zero compromises.
While it comes with a price tag to match its ambition and a few thermal quirks, the Legion 9i justifies its existence by delivering a user experience that is unrivaled in its class. It is a masterpiece of luxury gaming.
You can check the prices and configurations in our Specs System: https://laptopmedia.com/series/lenovo-legion-9i-18-gen-10/
✅ The Good
The first thing that strikes you is the exquisite forged carbon design. Each unit is unique, and combined with the rock-solid build quality, it creates a chassis that is both incredibly robust and visually mesmerizing. This premium feel extends to the fantastic keyboard and massive trackpad, which are a joy to use.
Under the hood, the performance is monstrous. The RTX 5090 is unleashed to its full potential, delivering class-leading gaming performance while running remarkably cool thanks to an advanced cooling system. The CPU also offers top-tier burst speeds. The upgradeability is simply insane, featuring four RAM slots (up to 192GB!) and four M.2 SSD slots, including PCIe 5.0 support, making it a true mobile workstation.
The connectivity is future-proof with dual Thunderbolt 5 ports and Wi-Fi 7. The display is excellent, offering great color accuracy for professional work, and the battery life is surprisingly decent for a machine of this magnitude.
❌ The Bad
The immense power of the CPU comes with a thermal cost. While the GPU stays frosty, the processor runs extremely hot under sustained load, frequently hitting high temperatures to maintain its clock speeds.
The display, while accurate, has an IPS panel with mediocre contrast and lacks the deep blacks of OLED competitors. Additionally, the sheer size and weight of this 18-inch behemoth make it firmly a desktop replacement; portability is technically possible but practically limited.
🆚 The Competitors
When compared to the MSI Titan 18 HX AI (detailed review), the Legion 9i feels more refined. While the Titan offers a mechanical keyboard and a brighter MiniLED screen, the Legion 9i counters with superior GPU cooling, a more unique design, and significantly better battery life, making it a more balanced flagship.
Against the ASUS ROG Strix SCAR 18 (detailed review), the Legion 9i justifies its premium with its unmatched upgradeability (4x RAM, 4x SSD) and Thunderbolt 5 support. The SCAR is a fantastic pure gaming machine, but the Legion 9i transcends that category to become a true luxury workstation hybrid.
Pros
- Stunning forged carbon design and rock-solid build quality
- Unrivaled upgradeability with 4x RAM slots and 4x M.2 slots (1x Gen5)
- Incredible GPU performance with excellent cooling
- Future-proof connectivity with dual Thunderbolt 5 ports and Wi-Fi 7
- Excellent keyboard and massive trackpad
- Color-accurate display suitable for professional work
Cons
- CPU runs extremely hot under sustained heavy load
- Display contrast is mediocre compared to OLED/MiniLED rivals
- Large and heavy footprint limits portability
Author: Simeon NikolovEditor-in-Chief at LaptopMedia.com with 20+ years of experience in testing and analyzing laptops and mobile devices.
Author: eng. Kroum NikolovHead of Engineering at LaptopMedia.com, inventor and innovator with 40+ years of experience in electronics and high technology.
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