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AMD GPU throttling and suttering with low temps

post #1 of 5
Thread Starter 
I bought a Sapphire Nitro 380X...

Much faster than my current GPUs, but stutters for "no reason" sometimes.

I let programs running making graphs, and the average GPU frequency was around 650hz, despite 100% GPU usage, and temp about 45C.

Since I never owned AMD GPU before, I have two questions:

1. Do AMD GPUs have some really low temp limit? Some of my nVidia GPUs I let them run at 95C with 24/7 usage.

2. How I get the AMD GPU equivalent of "PerfCap Reason" like nVidia GPUs have? It is very handy for troubleshooting.
post #2 of 5
There's a "Power Limit" setting in the radeon control center overdrive tab. When I was running my 290s I had to crank that up to about +15% to keep them from throttling. They do all kinds of downtuning to make the fans quiet and make the cards take less power.
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post #3 of 5
I had a similar issue a while ago... but too things;

1) If Vsync is turned on, then the card will only run as fast as it needs to generate the frames you need.
2) If you are CPU bound, then the card will only run as fast as it needs.
3) If your power limit is low, it can declock itself to be within that threshold. I actually doubt this is what is happening to you btw.


For point 3, you can actually raise the powerlimit further than 20% by editing the registry, which will do no harm, unless you actually screw up your registry for windows. That would likely be a reinstall.

From overclock.net:
http://www.overclock.net/t/1387430/amd-how-to-change-the-power-control-limit-from-20-to-50

From OcUK:
https://forums.overclockers.co.uk/showthread.php?t=18509458
post #4 of 5
Thread Starter 
Quote:
Originally Posted by Scougar View Post

I had a similar issue a while ago... but too things;

1) If Vsync is turned on, then the card will only run as fast as it needs to generate the frames you need.
2) If you are CPU bound, then the card will only run as fast as it needs.
3) If your power limit is low, it can declock itself to be within that threshold. I actually doubt this is what is happening to you btw.


For point 3, you can actually raise the powerlimit further than 20% by editing the registry, which will do no harm, unless you actually screw up your registry for windows. That would likely be a reinstall.

From overclock.net:
http://www.overclock.net/t/1387430/amd-how-to-change-the-power-control-limit-from-20-to-50

From OcUK:
https://forums.overclockers.co.uk/showthread.php?t=18509458

1. Issue happen with vsync on, and off, doesn't matter.

2. Issue happen in pure GPU tests, with CPU usage around 10% or less.

So, why it wouldn't be 3?

Still, I had some progress yesterday, and hit the limits of my PSU instead, so I will have to replace the PSU before I proceed testing more (I used the known workarounds about power and voltage, then hit OCCT GPU test with error checking disabled... the power usage DID increased, not much as I thought it would though, but before it could stabilize the PSU started to give only 10 volts in the 12v rail, then everything throttled down, probably out of safety, so I need a new PSU before I fiddle more with this).
post #5 of 5
fill out your system spec's. it helps with trouble shooting.
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