Go until you see artifacts you cant hurt your card b/c when you see artifacts just turn it down. Theres pretty much no way to hurt your card so see how high you can get. Every card is different
i'd imagine it'd be true in most cases but for some WILD reason i overclocked my 8500 pro, and for some reason i got to the threashhold where artifacts began to appear and the thing locked up. so i restarted it and it was artifacting even of the windows xp startup screen. this was when it was running at stock speeds w/ stock cooling. when windows started up it was a MESS, couldn't make anything out. then it locked completely and never started up again. i could have had a freak, or maybe ati tool messed w/ it a little too much... either way i'm back to an mx-440
I would be careful, esp with those programs that overclock it for you, I don't trust them anymore. Just do it yourself upping it by only 10mhz at a time and run 3dmark or something like it for awhile and check for irragularities. When you find one (or more) back it down a little and run a grapihically intensive program for awhile and make sure it's not doing it still. Like the guy above me said, aftermarket cooling is of great help. good luck and happy overclocking
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