you need to overclock your card and see if it reaches the standards of the bios you want to replace it with first then if everything is good and theres no artifacting for around 10 min then your card should be able to be flashed.<br />
by the way you should be able to flash your bios ill give you a link to see what bios you are looking for.<br />
<a href="http://http://www.techpowerup.com/bios/" target="_blank">http://http://www.techpowerup.com/bios/</a>
Read through this....find the section for your card <img src="/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" /><br />
<a href="http://www.overclock.net/faqs/22164-how-mod-your-x800-x850.html" target="_blank">http://www.overclock.net/faqs/22164-...x800-x850.html</a>
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