XFX 7950 Clock speeds revert to half during games

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s1ngularity

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Sep 10, 2012
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10,510
Hi, I just bought the XFX R7950 Black Edition, installed it with no problems, installed the latest driver from the AMD website, and everything worked just fine, at first. Frame rates were very good, but shortly I noticed the GPU clock speed would drop from 900Mhz to 500, even in intensive situations, and would cripple the frame rate. Now, frame rates are no better than that of my previous card (XFX 6850). Core load remained at 100%. All cables are plugged in fine, and my power supply should be enough (Cooler Master 500w 80+ Bronze), although I'm not 100% sure. This is the same on every game and benchmark application, and directly after a restart so no excess processes are in the way. I did not, though, remove the driver for my previous card, but I'm not sure that could cause this. This only seems to happen when I have my other 2 screens plugged in. I did some research on this issue but have yet to find a common problem/solution, any help on this would be appreciated, thanks.

Another issue, with both 1 and 3 screens, in ArmA2, with AA on and ATOC on, grass appears to have a strange cross-hatched alpha applied which looks very wrong, not sure why this is.
 
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KnowItAll

KnowItAll

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May 13, 2013
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What is the core temperature while your playing? What is the specs of your computer? What resolution? What is the model of the power supply? Some 500w CM psu's are really only 400w max.

 
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S

s1ngularity

Honorable
Sep 10, 2012
5
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10,510
Sorry, I should have added those details. My temps are around 70c when ingame.
CPU: Amd x6 1055T
MB: Gigabyte 78LMT-S2P
RAM: 4GB Kingston
Hard Drives: 128MB Crucial M4 SSD, 512GB Western Digital
PSU: CoolerMaster Silent Pro M 500W 80+ Bronze
Resolution 1: 1920x1080, 2: 1680x1050, 3: 1440x900

It could be that this PSU is only powerful enough to drive this beefy card with only 1 display and not all 3, but I hope not.

Edit: After a quick Google search, the 7950's power draw under full load can reach 330w, and the 1055t can draw 200w. These two alone are more than my PSU can handle. I thought about everything else before buying this card but not that. But then, why does the clock speed stay at max with a single screen? I suppose it could account for AA looking strange, if it's not getting the power it needs, could it?
 
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KnowItAll

KnowItAll

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May 13, 2013
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Does GPU-Z record the min/max temp during the gaming session like Hardware Monitor does? By the time your looking at gpu-z the temp could have dropped quite a bit.
Not to mention it's not even summer yet so your temps are bound to be much higher. Although it may or may not be part of your problem, you need to look at some better cooling solutions.
 
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s1ngularity

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Sep 10, 2012
5
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10,510
Actually I've got GPU-Z on a separate screen so can monitor temps as I go, and it does record min/max, or log to file. I'll do some more tests today and post my results. I have decent airflow and usually in a cold room.
 
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s1ngularity

Honorable
Sep 10, 2012
5
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10,510
The voltages were constant throughout the day, and during Dota/Arma/Unigine, at around 1.169v, temps maxed at 68c. The core clock would be 900Mhz for the first few second then revert to 500Mhz. I have a feeling that my 500w psu is just not supplying enough power.
 
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