Haha, no I just went into catalyst control center and upped the clocks to the highest.. I'm new at this, alright? lol
Try reading this guide on overclocking:http://www.tomshardware.com/forum/340404-33-wolfram-overclocking-guide
To answer the original question, this happens because you made the GPU unstable by overclocking. In this case you went all out and maximized everything, therefore you caused very high instability. This can void your warranty.
Next time research on the matter because if you had by chance highered the voltage to a maximum you could have fried your card, not to mention extra hardware damage.