Stop.
You seriously dont need to flash your card, so get that out of your head. You need to overclock it. My 8500 ran stable at 300/300. Dont be skeered...
<A HREF="http://rmitz.org/AYB3.swf" target="_new">All your base are belong to us.</A>
<A HREF="http://service.futuremark.com/compare?2k3=2216718" target="_new"><b>3DMark03</b></A>