OK, so I thought I'd use Furmark to get my max GPU clocks. Did so, got temps around 95C. Wondered what they'd go up to with P95 also running... So left both Furmark and P95 running simultaneously for an hour. GPU got to 100C, but no artifacts so I'm OK with that. BUT P95 failed on 2 threads - I have recently tested this same CPU overclock and it was 24+ hours stable on it's own. Interesting I thought, will add more CPU volts and try again. From now on, my final stability check will be simultaneous P95/Furmark testing. The PC must be working hard as the PSU fan is really loud, something I've never heard before.