Lenovo ThinkBook 13x Gen 4

LaptopMedia.com Laptop Specs Lenovo ThinkBook 13x Gen 4 Lenovo ThinkBook 13x Gen 4

Date Published: 26 Sep 2025

Intel Core Ultra 9 185H
Intel Arc (8-Cores)
13.5”, 2.8K (2880 x 1920), 120 Hz, IPS
512GB SSD
16GB RAM
1.00 kg (2.2 lbs)

TOTAL SCORE

8.7 Portability Excellent

9.0 Display EXCEPTIONAL

7.1 For Work Very Good

5.6 For Gaming Average

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Lenovo ThinkBook 13x Gen 4

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Review

Lenovo ThinkBook 13x Gen 4 in-depth review

The positive evolution of ultra-portable devices is undeniable. Now, you can get a 1-kilo machine like the Thinkbook 13x Gen 4 with the mighty Core Ultra 9 185H under the bonnet. Despite the compact dimensions, Lenovo has found a way to fit a big 74Wh battery. This, combined with the optional Intel Evo certification is a receipt for long autonomous life. It's not a surprise that the upgradability is limited because of the thin profile.Interestingly, if you pop the bottom plate (which makes almost zero sense since only the SSD is replaceable) you'll find a pretty sizable thermal system, which is rare for such a small machine. That's good because the 16-core 28W CPU dissipates more heat than a U-series processor and requires significant cooling.The LA3 chip is here to manage the devi[...]

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Pros

The aluminum chassis is built like a tank
The fans are non-intrusive during max CPU loads
Precise glass touchpad
Compact and light (12.9 mm / up to 1.23 kg)
Lighter magnesium version is also available (1 kg)
Good performance given the form factor
Up to 32GB of LPDDR5x-8400MHz RAM
PWM-free display (LEN135WQ+)
3:2 aspect ratio and wide viewing angles (LEN135WQ+)
96% sRGB coverage + accurate colors with our "Design and Gaming" profile (LEN135WQ+)
488 nits of max brightness (LEN135WQ+)
2880 x 1920 resolution + 120Hz refresh rate (LEN135WQ+)
IR Web camera + fingerprint reader
E-shutter switch
Well-lit keyboard with big keycaps and Smart sense backlight
3x Thunderbolt 4 ports
Decent clocks in long loads (2.34 GHz / 2.06 GHz for the P and E cores of the Core Ultra 9 185H)
Very long battery life (~17 hours of videos)
Good comfort under max processor stress
Snappy iGPU (140 FPS in CS2 on Medium details)

Cons

Short key travel
Complicated disassembly (the battery is attached to the bottom panel and the connector is held in place by two screws)
High CPU temperatures in medium loads (91°C)
No Type-A ports

Disassembly, maintenance and upgrade options

Opening the Lenovo Thinkbook 13x Gen 4Undo the six Torx-head screws on the bottom panel. Lift one of the top edges with a lever tool or your thumb to create a gap. Insert a thin plastic tool in the gap and start prying along the side, front, and other side. The middle exhaust vent is attached to the bottom panel, so pop the left and right zones of the rear before focusing on the central part. Raise the plate from the back and carefully flip it over.Undo the two screws that hold the battery connector and gently disconnect it.Wear gloves to avoid short[...]

DISPLAY: 13.5-inch, 2880 x 1920, IPS

Name
LEN135WQ+ (INT3480)

Diagonal
13.5"

Pixel density
256.39 ppi

Brightness
488 cd/m²

sRGB
96%

PWM frequency
No PWM (Flicker-Free)

Panel Type
IPS

Resolution
2880 x 1920

Becomes "Retina" from
13 inches (34 cm)

Contrast
1290:1

dE Color Checker
1.2 0.9

PWM Rating
10.0: (safe)

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Office Work

Office Work should be used mostly by users who spend most of the time looking at pieces of text, tables or just surfing. This profile aims to deliver better distinctness and clarity by keeping a flat gamma curve (2.20), native color temperature and perceptually accurate colors.

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Design and Gaming

This profile is aimed at designers who work with colors professionally, and for games and movies as well. Design and Gaming takes display panels to their limits, making them as accurate as possible in the sRGB IEC61966-2-1 standard for Web and HDTV, at white point D65.

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Health-Guard

Health-Guard eliminates the harmful Pulse-Width Modulation (PWM) and reduces the negative Blue Light which affects our eyes and body. Since it’s custom tailored for every panel, it manages to keep the colors perceptually accurate. Health-Guard simulates paper so the pressure on the eyes is greatly reduced.