4850 good overclock?

[lenoxlv]

Ok, so, I got a 4850 today, and overclocked it to 800/1103 with a the fan spinning at 60%. I ran furmark for 10 minutes - no artifacts, no nothing. The temp never got higher than 62 C.
So, is this OC save? Should I OC further?

 

[TheJONgamer]

I got to 800 flat on mine no probs then got a black screen and two flashing lights bring it back to factory bro it killed mine and it sucked.