There's a place in the CCC where you can let the cards find it's oc potential on it's own. It'll keep going til it crashes and then restart with the higher clocks set. I think it then asks if you want to keep it there. having said that,
1. don't believe everything you read and
2. once you get your oc, it won't be worth having the extra stress on your investment for the little bit you might get.
If you wanted a faster card, you should have bought one. Hope you get it working again.