Re: this computers fked up, OC 5600 deep software issues
Are you using an athlon XP 3000 or an athlon 64 3000? Either way 3.3ghz sounds a little high.
Another thing, heat isn't always the problem. Cards OC the same as everything else. Some just won't go above a certain clock speed. Try 375/575 and see how it goes. It sounds like it's just not handling the OC well.
For the reboots, if you are running windows XP you can disable that to just show you the blue-screen instead of rebooting. That way you'll atleast have some sort of message to be able to figure out what's going on. To do that, go to System Properties->Advanced Tab->Startup and Recovery->Uncheck the "Automatically Restart" box.
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