Lenovo ThinkPad L15 Gen 4 (Intel) review – sturdy business notebook that offers good comfort under load
Temperatures and comfort, Battery Life
Max CPU load
In this test we use 100% on the CPU cores, monitoring their frequencies and chip temperature. The first column shows a computer’s reaction to a short load (2-10 seconds), the second column simulates a serious task (between 15 and 30 seconds), and the third column is a good indicator of how good the laptop is for long loads such as video rendering.
Average P-core frequency; Average E-core frequency; CPU temp.; Package Power
| Intel Core i7-1355U (15W TDP) | 0:02 – 0:10 sec | 0:15 – 0:30 sec | 10:00 – 15:00 min |
|---|---|---|---|
| Lenovo ThinkPad L15 Gen 4 (Intel) | 3.34 GHz @ 2.54 GHz @ 86°C @ 39W | 3.16 GHz @ 2.45 GHz @ 93°C @ 35W | 2.38 GHz @ 1.77 GHz @ 77°C @ 20W |
| Lenovo ThinkPad T14s Gen 4 | 3.78 GHz @ 2.93 GHz @ 82°C @ 48W | 3.45 GHz @ 2.71 GHz @ 90°C @ 41W | 2.52 GHz @ 1.87 GHz @ 78°C @ 22W |
| Lenovo ThinkPad T14 Gen 4 | 3.83 GHz @ 2.89 GHz @ 78°C @ 51W | 3.7 GHz @ 2.82 GHz @ 93°C @ 49W | 2.38 GHz @ 1.75 GHz @ 64°C @ 21W |
| Acer Aspire 5 (A514-56M) | 3.82 GHz @ 2.82 GHz @ 64°C @ 55W | 2.18 GHz @ 2.26 GHz @ 65°C @ 37W | 1.43 GHz @ 1.98 GHz @ 60°C @ 28W |
| Dell Vostro 15 3530 | 2.06 GHz @ 2.70 GHz @ 94°C @ 40W | 1.56 GHz @ 2.22 GHz @ 96°C @ 26W | 2.06 GHz @ 2.25 GHz @ 95°C @ 26W |
| Lenovo Yoga Book 9 (13IRU8) | 2.23 GHz @ 2.58 GHz @ 76°C @ 40W | 2.13 GHz @ 2.42 GHz @ 85°C @ 35W | 1.64 GHz @ 2.03 GHz @ 77°C @ 24W |
| ASUS Zenbook S 13 OLED (UX5304) | 3.46 GHz @ 2.47 GHz @ 80°C @ 41W | 3.06 GHz @ 2.24 GHz @ 91°C @ 31W | 2.36 GHz @ 1.68 GHz @ 75°C @ 21W |
The Core i7-1355U inside of this machine can sustain high frequencies during any kind of load but they are a bit lower compared to the two more premium siblings – the ThinkPad T14s Gen 4 and ThinkPad T14 Gen 4.
Comfort during full load
The single fan is almost quiet in Performance mode during max CPU load. In this case, the keyboard just feels warm and it’s comfortable for usage. As you can see from the screenshot below, the power presets are integrated into the Windows Power modes.
The fan spins with around 1800 RPM in idle and with ~3000 RPM under heavy processor stress.
Idle
Max CPU loadBattery
Now, we conduct the battery tests with Windows Better performance setting turned on, screen brightness adjusted to 120 nits and all other programs turned off except for the one we are testing the notebook with. The 57Wh battery lasts for 8 hours and 20 minutes of Web browsing, or 6 hours and 15 minutes of video playback.
Brightness: 180 nits; Display Mode: SDR
Time to Full Discharge: Higher is Better
In order to simulate real-life conditions, we used our own script for automatic web browsing through over 70 websites.
Author: Nikolay Palaozov
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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