Thats unfortunate. I've built dozens of PCs for people and only rarely had the odd bit of corsair tech go bad. Always RAM, but even then most of it is perfectly fine. sounds like you got unlucky as hell OP!
i have a desktop with a 7970, i7 and 16 gigs of ram and i can't run the witcher 2 with uber sampling, at least not at an enjoyable framerate. it's not a code issue, it's just doing TWICE as much work as it would be otherwise and it's already a beautiful looking game.