I have the club3D HD7950 RoyalKing which has a standard clock of 880MHz and a standard boost of 930MHz. When I'm running a game, BOINC or a benchmark the GPU will use the boost frequency for a few seconds and then reverts to the standard clock.
- It isn't a problem of heat, the GPU runs at 50°C under full load.
- The PSU is probably not an issue either, got 550 Watt. The GPU uses the boosted clock for a while, so if the PSU is the problem, it shouldn't work at the boosted clock anyways. (am I correct here?)
- I've googled a bit, and others report being stuck at 500MHz when running flash. This was fixed by turning flash hardware acceleration off. I've tried this too, but it doesn't help.
I'm using the latest stable drivers for ATI cards (13.1)
Any idea what might be wrong? Are there any other troubleshooting steps I should take?
EDIT: I was monitoring my performance with MSI afterburner, and I found something interesting. It runs at boost frequency (at 1000MHz at the moment). Until the GPU usage reaches 100%. Then the core clock is constantly adjusted. Or well, it could actually be the other way around. The core clock gets adjusted and thus performance reaches 100%. FPS in game also drop from 90 to 70 at that point.