Extreme Intel/AMD CPU and APU Underclocking and Undervolting For Maximum Battery Life Using Universal x86 Tuning Utility
YouTube channel Just Josh recently released a video review of Lenovo Yoga Slim 7i 14 laptop with Intel Ultra 7 258V CPU.
Terribly-named CPU aside, the laptop was able to deliver jaw-dropping battery life in the video playback test:
These are record-setting results that are even better than those of ARM-based Apple laptops, let alone other x86-based Windows machines! When I showed this review to a good friend of mine, we had quite a debate, since he couldn't or wouldn't believe those results. Afterwards, I decided to compare Yoga Slim 7i to my own Lenovo IdeaPad 5 Pro 14ACN6 laptop in terms of battery life in such a use scenario.
My 14ACN6 (released Feb, 2022) features an 8-core AMD 5800U CPU, 16GB of DDR4 RAM and a 56Wh battery. In conditions similar to those in the review (power saving mode, looping 1080p H.264-encoded H/W-accelerated video playback at 200 nits of brightness) The laptop delivered 7h 40m of battery life.
So about 8 hours for a brand new unit, considering the 96.3% battery health of mine. But then, the review model of Lenovo Yoga Slim 7i 14 had a fairly beefy 70Wh battery. To compare apples to apples, I'll simply add 25% to my test results, so that with the same battery the best theoretical case scenario for this laptop would allow for about 10 hours running off the grid. Certainly a far cry from the 7i's results…