I wouldn't be wont to try it without proper BIOS support.
Seriously.
It sucks, I know. But, you'd be better off getting a new MOBO anyway. There's much to gain from that: USB 2.0, SATA, AGP 8X, and the like.
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<b><font color=red>Three great virtues of a programmer are: laziness, impatience, and hubris.</font color=red><b>