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日本Dell Latitude 14 7440 review – stylish laptop with good cooling solution
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 |
|---|---|---|---|
| Dell Latitude 14 7440 | 3.65 GHz @ 2.67 GHz @ 83°C @ 44W | 3.26 GHz @ 2.43 GHz @ 94°C @ 36W | 2.63 GHz @ 1.87 GHz @ 76°C @ 25W |
| Lenovo ThinkPad L14 Gen 4 (Intel) | 3.59 GHz @ 2.66 GHz @ 80°C @ 39W | 3.52 GHz @ 2.68 GHz @ 94°C @ 39W | 2.50 GHz @ 1.84 GHz @ 77°C @ 20W |
| HP Pavilion 15 (15-eg3000) | 3.67 GHz @ 2.80 GHz @ 76°C @ 45W | 2.67 GHz @ 2.06 GHz @ 73°C @ 25W | 2.22 GHz @ 1.73 GHz @ 69°C @ 18W |
| HP ZBook Firefly 14 G10 | 3.83 GHz @ 2.88 GHz @ 74°C @ 49W | 3.74 GHz @ 2.90 GHz @ 86°C @ 49W | 2.69 GHz @ 1.96 GHz @ 75°C @ 23W |
| HP ZBook Firefly 16 G10 | 3.85 GHz @ 2.89 GHz @ 67°C @ 50W | 3.32 GHz @ 2.48 GHz @ 75°C @ 37W | 2.14 GHz @ 1.44 GHz @ 66°C @ 17W |
| HP EliteBook 860 G10 | 3.90 GHz @ 2.95 GHz @ 77°C @ 50W | 3.35 GHz @ 2.12 GHz @ 86°C @ 36W | 2.48 GHz @ 1.77 GHz @ 65°C @ 20W |
| Acer TravelMate P2 (TMP216-51) | 3.90 GHz @ 2.93 GHz @ 89°C @ 55W | 2.73 GHz @ 2.49 GHz @ 86°C @ 37W | 2.93 GHz @ 2.08 GHz @ 77°C @ 28W |
| Acer TravelMate P6 (TMP614-53) | 3.52 GHz @ 2.59 GHz @ 67°C @ 45W | 3.22 GHz @ 2.40 GHz @ 73°C @ 40W | 2.63 GHz @ 1.90 GHz @ 72°C @ 28W |
| Lenovo ThinkPad X13 Gen 4 | 3.76 GHz @ 2.88 GHz @ 85°C @ 50W | 3.46 GHz @ 2.67 GHz @ 97°C @ 44W | 2.02 GHz @ 1.55 GHz @ 69°C @ 18W |
| Lenovo ThinkPad X1 Carbon Gen 11 | 3.66 GHz @ 2.80 GHz @ 94°C @ 49W | 3.23 GHz @ 2.50 GHz @ 97°C @ 38W | 2.00 GHz @ 1.55 GHz @ 72°C @ 19W |
| Lenovo ThinkPad X1 Yoga Gen 8 | 3.67 GHz @ 2.81 GHz @ 82°C @ 49W | 3.32 GHz @ 2.53 GHz @ 94°C @ 39W | 2.17 GHz @ 1.64 GHz @ 76°C @ 20W |
| Lenovo ThinkPad E14 Gen 5 | 3.49 GHz @ 2.65 GHz @ 69°C @ 42W | 3.28 GHz @ 2.46 GHz @ 82°C @ 38W | 2.20 GHz @ 1.62 GHz @ 77°C @ 23W |
| 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 our notebook can sustain 2.63 GHz for the P cores and 1.87 GHz for the E cores alongside a 25W power limit in prolonged periods of 100% CPU stress. This is a respectable result for a light 14-incher. Still, in medium loads, the chip temperature hits 94°C but at least it settles at 76°C in the long run.
Comfort during full load
In “Ultra Performance” mode, the fan is audible but not noisy (when the CPU is under heavy stress). For normal usage, the “Quiet” preset is the sweet spot because the fan is almost nearly silent in this mode. During max processor load, the left and the central side of the keyboard don’t feel too hot to the touch. This means you can use the laptop for work even when the internals are working hard.
Battery
Now, we conduct the battery tests with the 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 14 hours and 17 minutes of Web browsing, or 11 hours and 7 minutes of video playback. That’s a respectable result considering the modest capacity. To achieve that, you have to apply the “Balanced” preset in the Windows “Power & Battery” menu and select the “Optimized” power plan in the BIOS.
In order to simulate real-life conditions, we used our own script for automatic web browsing through over 70 websites.
For every test like this, we use the same video in HD.
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