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Can a PSU not support GPU intermitent voltage spikes?

post #1 of 6
Thread Starter 
Hello people. I'm getting problems with my R9 390 Sapphire Nitro since march which i purchased in december/2015 together with my EVGA 750 B2. So directly to the problem my system get Black Screen of Deaths in a specific condition, only when browsing and when browsing AMD GPU insanely active their memory clock spikes which keep jumping from 150 to 1500mhz back to 150mhz in less than a second for a long period in low load applications like video playback.

"But then GPU is faulty" someone will say, yes maybe, but the card dont cause problems when at full load in 3D applications and with GPU memory clock stuck, since GPU memory has only 2 stages (150mhz and 1500mhz) if i keep memory stuck at 150mhz or 1500mhz while browsing it fix the black screen of death in my main setup which is i74770k+Z87+EVGA750B2.

Other point, i recently changed the card for test purpose to my "setup 2" which is a old AM3+CX500. So what? Then there the problem with GPU memory clock/voltage spikes dont happen.

What come to my noob mind is there has 2 probably possibilities, AMD GPU drivers has some bug with my Intel Z87 chipset/drivers or (this something i just guessing since i'm not a electrical expert) can my EVGA 750 B2 have some problem to deal with this GPU intermitent voltage spikes?


So i tested both R9 390 and GTX770 playing same video at 480p VP9 in chrome browser at youtube and there is just a demonstration how both AMD and NVIDIA cards work in their clock/voltage in easy tasks. Just to point out everytime AMD memory clock spike to 1500mhz VDDC spikes together.

AMD and Sapphire call these spikes a "feature", which i dont like much.

Thanks in advance.



390memspikeam3test2.jpg 113k .jpg file

770memclockLGA1150v2.jpg 98k .jpg file
Edited by chumanga - 9/1/16 at 2:37am
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post #2 of 6
The Haswell (4770K) CPU's need a Haswell certified PSU. Is yours Haswell certified?
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post #3 of 6
Thread Starter 
I dont find a list for this PSU, but while running iGPU or GTX770 in my i7 4770k this EVGA 750 keep the system full stable. The problem only occur with R9 390 spikes.
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post #4 of 6
It makes no sense that the psu is at fault here. Just because the gpu spikes doesn't mean anything... unless it isn't the 12V rail that spikes and is something else. Mmmmmmmmmmm...
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post #5 of 6
Thread Starter 
Only thing come to my mind is the AMD drivers being bugged with my z87 chipset then.
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post #6 of 6
The Hawaii GPUs sometimes seem to enjoy doing this... I would disable ULPS to see if it still acts up. This likely is not a PSU issue.
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