Why 4k videos are so damanding on PC?

[Gazi]

Every time i watch some 4k video it takes a lot of power from my cpu, if its 60fps video it can take 100% of my cpu usage and it is i5 6600k @4.4GHz. Its weird for me, because on my waaaay les powerfull windows tablet 4k video takes almost no power.

 

[rgd1101]

It is running at based freq? or powersaving mode when viewing 4k video?

 

[TJ Hooker]

What source/codec are you using to view 4k? My best guess is that your PC is decoding the video on software, while your tablet is using a hardware decoder in its GPU which is much more efficient.

 

[Gazi]

iam watching on YT and yes, it takes 4.4ghz power on all 4 cores. for comparsion fullhd video takes like 10% power.

 

[lightc]

Are you sure you're not running any background process? YouTube 4K shouldn't be loading your CPU 100% on all cores. My HTPC aging i3 can runs 4K YT videos at about 40-50% max load on 3 trheads, and no dedeicated GPU in system.

Go to task manager and check which process is loading your CPU to 100%, the best is- switch everything off and leave just single tab for YT 4K video and then check what your CPU usage is.