Its not only me - plenty of people had problems with the 330 branch(look on OcUK even). I have a GTX660 BTW.
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Apart from the DDU bit (I couldn't remember what it was called and a quick search didn't help me) I have largely kept the drivers up to date. The problem started late last year.
I was about to say I've now reverted to 337.88 and it seems a lot more stable - but it faulted on me even as I was typing. Ho hum.
For what it's worth I'm on a 3yr old GT520 which does all I want to do. Maybe it's just knackered or the drivers are too demanding. Any upgrade would seem to require PCI 3 which means a new mobo, etc, etc and I don't really *need* to replace my PC :)
And it just faulted again.
r330 was a bit problematic with Fermi cards as well (both desktop and mobile), alongside not particularly stellar performance.