Help! Problem with Sapphire Radeon HD 6870

I am having a problem OC'ing my Graphics Card. when I tried overclocking it using CCC, my computer crashes..
I downloaded Sapphire TRIXX Utility and it showed me this:



System Specs:
Intel Core i5-2500K
Gigabyte GA-Z68X-UD3H-B3 REV 1.3
Kingston 8GB HyperX 1600MHz
Sapphire Radeon HD 6870 1GB GDDR5
Reference Site for my card: http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1037&pid=1026&psn=0006&lid=1&leg=0

Please Help!