I ran hardware test and memtest non stop on the Vengeance and returned no issues whatsoever. Felt confident that all is ok then the sudden crash couple of hours into playing Sim City.
I think people here with iMacs loaded with 32gb 1.5v ram will need to run their iMac for a few hours at least to see it happen.
Thing is, i'm on 1.35v now and it still crashes and I have seen others who have 1.35v and crashes on the new 2013 imac and they are still on 10.8.5