A 4k screen has four times more pixels than a 1080p screen, and the power for those extra pixels has to come from somewhere. More graphics. Horsepower is obviously required to drive a larger number of pixels, but how much power does the display use and does it make a practical difference to the overall battery life of your laptop to test? This I've got through laptops that are essentially identical in terms of hardware. Specs, with the only difference being, the one has a 4k screen, while the other has a 1080p screen. Both laptops have an intel, 6700 HQ, CPU, NVIDIA, 970m, graphics card 16, gigabytes of ddr4 memory and an m2 SSD, or if laptops have all windows and NVIDIA driver updates to date installed, and nothing else was running during testing. Although both laptops have the same size. Battery are almost the same age and up around the same usage it's possible that there may be small differences between the batteries as use over time can degrade them. I haven't been able to accurately measure this, but I wanted to point it out as it could be. A contributing factor to consider, despite this, I think these two laptops are as close as can be in our ideal finish test, I performed testing using the heav'n benchmark. I mostly picked this because it runs on an indefinite loop, so I could just leave it running until the batteries ran out. Both laptops had kept it running the benchmark at 30 frames per second from invidious battery boost feature.

I could have turned this off, but I was concerned that by allowing the graphics cards to max out, the battery would read much faster, making it more difficult to see what we actually care about a difference in screen on time, if any, also, by cutting the frame Rate to a solid 30 on both laptops, I think we have more of a guarantee that they're doing the same amount of work in the first test. The 4k laptop also ran the benchmark with a 1080p resolution. That way, I could be sure that the graphics card was really doing the same amount of work as the 1080p laptop. So basically, these tests should be as close as possible, allowing us to determine if there's any difference, based purely on the pixels being powered on in the display in this test, the 1080p laptop lusted for just over seven minutes more than the 4k one. So there's a little difference there, which seems to indicate that the 4k display is reducing battery life due to the extra pixels next I've run the same test again except time. The 4k display is running at a 4k resolution and again I've left. It capped at 30 frames per second so that we get the same experience as the 1080p in terms of frames per second. This test should show a larger difference in battery life as we're now, accounting for the extra work. The graphics card needs to do to actually render at 4k, whereas before it was just upscaling from 1080p to make use of all the pixels.

The results clearly showed that the laptop with the 4k display is running out of battery much faster. Now, owing to the fact that the screen is powering four times more pixels, the battery life is only just over half as good when compared to the 1080p laptop. Although this test is a very small sample size, I think it does go to show that there is some justification to 4k displays using more battery power and is therefore worth considering when buying a 4k laptop just powering. The extra pixels uses a little more battery, while the extra stress on the graphics card at 4k, almost half the battery life I'm, not a fan of having a 4k screen at a laptop of this size, mostly because of how bad so many upscale it's just a Poor experience and now that I've confirmed how much more battery is required to drive the display I'm kind of glad that I still run with 1080p on all my laptops. Of course, this is a personal choice, if you're after a 4k laptop just keep in mind that it will use up more of your precious battery life faster when compared to a 1080p panel. So what did you guys think about the power differences between 4k and 1080p? Displays will it affect your choice when buying a new laptop personally, I wouldn't get a 4k display on a laptop for many reasons, but this is just another reason for me to stay away from 4k.

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