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7950 Fluctuating core clock if OC'd

post #1 of 6
Thread Starter 
Hi all,

I am pretty new to overclocking GPUs. I have a Powercolor 7950 HD (with Boost, not the dual fan PCS+ edition). I decided to monkey around a bit with overclocking it and noticed some strange behavior.

Quick numbers
Stock Core - 925 (technically it is 800 and 925 with Boost)
OC - 1000
Stock Memory 1250
OC - 1325
I am leaving the power settings alone

If I use MSI Afterburner (or some other tool) to increase the core clock speeds to the settings above, and I run a stress test (using OCCT right now) I see that the core clock speed I have set it to does not hold there and it frequently is below the core clock speed for the rest of the test (by as much as 200).

Even stranger, if I have the OC running and play specifically Planetside 2. My monitors show that the core clock drops to 500 during game play. My GPU utilization seems "normal" at around 95+ usage. When I tried this with a few other games (BioShock, CS:GO, ARMA2), my core clock held around the normal levels but still below the OC'd clock speed of 1000mhz by 100-200.

I don't experience any crashes, or artifacts on the screen so I am not sure if this is a stability issue where I need to boost the power slightly to support the OC. I am kind of at a loss of the Planetside issue in general.

Should I attempt to clean out the old drivers and reinstall it?

Am I missing some sort of setting in Afterburner or somewhere else? I have fully disabled overclocking in the ATI tool of both my GPU and CPU.

Thanks for the help.
Edited by tyhboom - 6/11/13 at 8:36am
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post #2 of 6
You need to raise the power slider in CCC under performance tab. I run my MYST 7870 xt's at +8 to make them run my overclock without doing that. Afterburner may have something like that as well but I've never really used it so not sure. There is nothing wrong with your card though so RMA is not necessary.
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post #3 of 6
Thread Starter 
I will give that a try when I get home later. There is a power modifier setting like you described in afterburner.

But when I usually read around, a lot of people say that with stock voltages they can reach pretty decent OCs with the 7950 edition. When I read the reviews for this specific model, a lot of the people could hit higher OCs without modifying the power. That is what made me unsure of what the problem was.
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post #4 of 6
Quote:
Originally Posted by tyhboom View Post

I will give that a try when I get home later. There is a power modifier setting like you described in afterburner.

But when I usually read around, a lot of people say that with stock voltages they can reach pretty decent OCs with the 7950 edition. When I read the reviews for this specific model, a lot of the people could hit higher OCs without modifying the power. That is what made me unsure of what the problem was.

Stock voltage does not tell anything because it varies. Newer 7950 have locked voltage pretty high (1,25v) and thats why they oc alot on stock. Mine came with 0,9v stock voltage and didn't oc high but that didn't matter because I have unlocked voltage. But your "problem" is because you haven't raised power slider, you can put 20% straight away.
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post #5 of 6
Thread Starter 
Voltage was the issue. The "stock" level was .950 so bringing it up made it stable across applications.
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post #6 of 6
No. A fluctuating core clock will not be fixed by raising the voltage. All you did was increase power demand even more, causing it to throttle lower than before to maintain the same power draw.

Raising voltage allows for higher overclocks.

Raising power limits allows overclocks to actually apply.
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