Need some AMD overclokers who are familiar with Trixx or other AMD OC tools, here's a step by step rundown of what I have done so far... Got a Sapphire HD 7950 Vapor-X OC (950mhz boost on 2nd bios) I can OC with AMD OD to 1070mhz core and 1575mhz RAM Try to OC core more than 1070 and get a driver lockup and recover No voltage control in amd OD (power limiter already set to +20%) Installed Trixx and set to 1600mhz RAM, 1100mhz core, +20 power limiter and VDDC to 1100-1150 Run benchmark (3dMark11) crashes with driver fault Trixx core and mem clocks stay the same though VDDC always returns to 975 GPUZ never reports any change in VDDC, always stays at 1.035v regardless of settings in Trixx Hopefully that will give you an idea of what my issues are, just a few things.... In AMD OD I can hit 1070core 1575mem (top clock) with no voltage adjustment. I would like to hit 1100+ core so think I need to be tweaking voltage. Is this what VDDC is for in Trixx? Why doesn't GPU-Z notice change in VDDC? Why does Trixx return to stock 975 VDDC when driver recovers? TL;DR I want to hit higher than 1070mhz core which is the highest stock voltage OC on my 7950. How do I do it?