CPU frequency going down under load and very high cpu usage while watching youtube 4k videos

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psych123

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Mar 5, 2014
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Hello,

This is my system:
Gigabyte B85M-D2V | Intel Xeon E3-1231v3 | Kingston hyperX 8GB | 9600GT | Chieftec CHP-500A 500W | Windows 7 64 bit

Under Prime95 load this is the result, stable 3600mhz:
82mjqmX.png


Under LINX/AIDA64 stability/Intel Burn Test etc. the cpu frequency is going down to 3400mhz:
OfUl6x4.png


And i just tested youtube video, frequency still goes down at random times and the cpu usage is extremly high, friend told me that he has 15-20% cpu usage with i5 at the same video...
r6i6wBI.png


This is my bios:

VoOQxdf.jpg
 
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Eximo

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My guess would be that your 9800GT is old enough that it can't do the render job for a 4K video. Maybe no support for the VP9 format youtube uses for 4K? I don't see any mention of h.265 support on the 9600GT either.

In which case your CPU would take on all the load.

What GPU does your friend have with the i5?
 
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Eximo

Eximo

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GTX770 would handle all the video decoding I would think. I5 would just be handling the data shuffling.

Temperature throttling I would assume.

It is either doing brute force to decode that video or using one of the newer haswell core instructions sets. AVX2 or some such.

AIDA is usually pretty comprehensive, but you may just be seeing what happens when only a small part of the CPU is heated very rapidly.

If you friend is willing to lend his GTX770, in the name of science, then you could give that a test.

Another consideration is if you are running that video through Flash or HTML5. I would hope HTML5 would be more efficient.

 
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bmacsys

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Yup, sure sounds like thermal throttling.
 
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psych123

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I'm running HTML5, as for temperature, in prime95 for a while it stays at 3600mhz, but at tests that make it heat less, such as aida64 stability test, its going down to 3400mhz, thats why i find it weird... and temps are pretty normal too, like, under 70 for all cores at most stressful times, so it shouln't be that.
 
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Eximo

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That data sounds exactly like the problem. Prime stresses only certain parts of the CPU. AIDA is usually more comprehensive. If it is throttling down to 3.4Ghz only during that test and the video playback, then it is almost assuredly one of the new instruction sets being used to decode the video.

If it is managing the heat in just that area the core temperature might look normal. They either have a separate sensor on the section that doesn't get picked up by your monitoring tools, or they use an algorithm to make sure that part doesn't overheat. Uneven heating is not a thing you want happening in an IC.
 
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Eximo

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From the observed data.

What the chip does internally may not be reported or detected by AIDA, that would be up to the developers of that product to determine.

To me, disabling turbo is a form of throttling. They are referring to it as when the CPU underclocks itself to avoid damage.
 
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