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I'd never buy a pre-overclocked system, they simply can't run enough stability tests on them before they sell them.
I'd ring up OcUK to get help with your OC profile as you paid for an overclocked bundle. Maybe direct them to this thread. Seems to be fairly common that systems just on the edge of stability are crashing out with the addition of a 58xx card. No clue why though.

RMA the overclocked kit if its still crashing with a different card?
Sorry to hear the troubles you're having![]()
I can vouch for this. Had my i7 at 4.2GHz and was rock solid for days, then started getting GSODs. Backed it off to 3.8GHz and nothing for two days with my 5870.
Gonna sneak back up to 4GHz and see if my computer gremlin notices!![]()
Exactly. Funny thing is I decided to buy this system which is identical to a mates, purely because of how good he was saying it was! If it wasn't that I lost time with RMA'ing first gfx card I'd have returned everything under distance selling act.
Now with the time lost, I have no option other than to keep it.