Motherboard Upgrade?

I can't see what the problem would be, the card should be 4x backwards compatable. You might need a better power supply.

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To support Crashman's claim about power requirement, <A HREF="http://www.tomshardware.com/graphic/20040414/geforce_6800-06.html" target="_new">see here</A>. Otherwise, your board should support it.