I recently got a Sapphire Radeon HD 7950, and I'd like to try overclocking it. With my old video card, the Catalyst Control center had a "test custom clock" button in the AMD Overdrive section, but that button is missing now. It was incredibly useful for obvious reasons, I've googled the issue, but I can't find anything helpful or definitive. I tried reinstalling CCC but there's still no button.