The guys over at [URL=http://www.xtremesystems.org/]Xtremesystems[/URL] have figured out how to volt mod the GeforceFX 5600 and 5900. Their guide can be found [URL=http://www.xtremesystems.org/forums/showthread.php?s=&threadid=18022]right here[/URL].

As a side-note I'll have a Radeon 9800 Pro volt mod guide posted soon...