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I'm using Afterburner to "natively" overclock a 7950, having used the "-xcl" option. From what I understand, this bypasses the need for unofficial Afterburner overclocking, and instead unlocks the limits through Catalyst Control Center, which CCC then manages/controls.
The problem is that although I have an overclock setting of 1150mhz core clock, after a little while in-game, it drops down to around 750mhz, constantly fluctuating up and down a few mhz. I'm guessing this has something to do with AMD's PowerPlay?
I've tried closing down CCC and MOM to stop this, but it continues to happen. I have to continually alt-tab out of the game, reapply an overclock in Afterburner, alt-tab back into the game, and start playing again. But it's only a matter of time before the core clock gets clocked back down to a constantly changing core clock. I have no idea why this is happening, or what the mechanics of PowerPlay are.
How do I stop this from happening? It severely kills performance. It's done this so far in Starcraft 2, and also Far Cry 3.
(NOTE: I asked this on Gaming, but was closed and pointed here)
3What kind of temps are you getting? It could be overheating and throttling back down... – Breakthrough – 2013-03-28T23:31:07.300
I'm having the exact same issue as I try to overclock with MSI Afterburner and FurMark. It's like to boost clock runs for a period of time (seconds) and then it defers back to AMD Reference 900-ish MHz setting.... I don't know about OPs, but my temps are at 70c. – Frank V – 2013-03-29T15:18:21.620
So, I switched from furmark to unigine heaven and I'm not observing the down-clock. It's holding my OC right now at 1100 and I've been benchmarking and letting it continue to run... Interestly, the temps are lower in Heaven than furmark. I'm averaging 62 in Unigine Heaven vs 71 in FurMark... – Frank V – 2013-03-29T15:59:01.230