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ATI x850 xt-unlock chip..

I would like to flash the Bios on my ati x850xt card,boosting the cards memory from 540mhz to 1.19mhz.The problem is I'm worried about graphic corruption occurring,it seems this happens in useing ATI Tool.I can not raise the memory past 600mhz.Has anyone out there used one of these cards on a Dell dimension before,and unlock the chip.If so let me know if your computer handled the upgrade alright..Thanks
1gig mem.
800 fsb.
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