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what is bootlenecking HD videos in power save mode ?

specs: Win 10, AMD Phenom 4 965BE 4x3,4 Ghz, 8 GB RAM, GTX 970

 

I really don't understand why playback of HD videos (in youtube or external program) is choppy in power save mode of 4x0,8 Ghz when processor load is only 20% and all params (like: motherboard Bus clock, NB clock, HT clock, memory speed and GPU Mem&Video Clock) are the same in HWiNFO when switching to higher power plan mode. The only difference is of course processor load and  +20Watt more due to higher voltage on it, but in power save mode it has still plenty of free avaiable resources.

 

So what is going on ? This is some kind of hardware bottleneck or rather Windows problem ?

 

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There are some windows 10 settings for video playback on power saver mode check those out

SPEC LIST:

  • CPU: AMD Ryzen 9 5950X w/ NZXT Kraken Z73 360mm Liquid Cooler
  • GPU: NVIDIA RTX 3090
  • RAM: Corsair Dominator Platinum RGB 32GB (4 x 8GB) 4800MHz C18
  • Motherboard: Asus ROG Crosshair VIII Formula
  • SSD: Corsair MP600 PCIe v4.0 2TB (x2)
  • PSU: Corsair HX1200i
  • Case: NZXT H710
  • Monitor: Samsung Odyssey G9 49in Curved 240Hz 1ms
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I already know the answer. A few minutes of testing, answered my question ...  Sry for trouble.

 

My task manager is not showing correct values of CPU usage. Probably due to some windows service turned off or becouse of Windows LTSC bug

 

obraz.png.11b2d04a8ef744884425da74ed46c4bc.png

 

While HWiNF064 showed the truth:

obraz.png.6ae3639deedec0e4ec1d795a13851008.png

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Why you put a desktop CPU in powersaving mode?

800mhz is a very low number, it will struggle to playing videos.

25% meaning the video is playing on a single core.

single core 800mhz is a pentium 3 level performance.

Ryzen 2600 @ 4ghz | Radeon RX580 | 32gb HyperX 3200mhz | 500gb Samsung PM981a | 5 TB HDD | Corsair CX450

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13 minutes ago, SupaKomputa said:

Why you put a desktop CPU in powersaving mode?

800mhz is a very low number, it will struggle to playing videos.

25% meaning the video is playing on a single core.

single core 800mhz is a pentium 3 level performance.

I am using computer in power save mode to save energy of course. When everything is working ok in 4x0,8 GHz, then I don't want to switch my CPU from low 25 Watt mode to >35 Watt while doing the same work, with the same computer behaviour.

 

As I stated in previous post, problem was wrong Task Manager CPU usage reported by Win 10 LTSC. In video playback it reported about 25% on all cores, while in reality it was close to 100%. Now I know, that i have to switch to ballanced power plan while watching HD videos.

 

And I found this article about bug in LTSC:

 

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