would this
http://cgi.ebay.co.uk/Corsair-VX-450W-SLI-Crossfire-Ready-Power-Supply-PSU_W0QQitemZ330234386783QQcmdZViewItem?hash=item330234386783&_trkparms=39%3A1|66%3A2|65%3A2|240%3A1318&_trksid=p3286.c0.m14
power this
http://www.amazon.co.uk/Inno3D-nVidia-8800GT-512MB-Graphics/dp/B000XT1VOM
and would they be compatible in a dell inspiron 531 base unit
cheers
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