Caporegime
Bloomin eck! I was just having a dabble with benching this and looking at power consumption and here's what happens:
2600K @4.7 1.344v
7970's @1200/1600 1.244v = 655w peak
7970's @1260/1900 1.3v = 780w peak
Either way, the game's playing funny buggers with me as it decides to CTD with no error message or nowt at the end of the first stage even at stock clocks... Ah, whatever.
I get the same Pete. No idea why but tried running the bench at 4K and it did it and at 1080P and it did it. Couldn't be bothered to see why, so moved on.