So I've overclocked my 6770 from 850/1200 to 960/1310. The RAM won't go any higher, but I'm not getting any errors or artifacting with the core at 960 and can't move the slider in AMD's overdrive any further. I've tried powerstrip but it doesn't modify the clocks when it says it does (yes, with overdrive disabled), and I've tried MSI's afterburner, but it won't go past 960mhz either. Is there something I'm forgetting to do? Or is there some sort of hardware restriction on the clock speeds past 960?