I planned to use 2-3 GeForce graphics cards on 1 motherboard to fold with.

I forgot one thing and now have to perform an upgrade on my power supplies.

Here is a web site which will probably help whether your planning on using ATI cards or NEVIDIA cards to fold with.

http://www.slizone.com

They have all sorts of information on which motherboards will allow multiple cards, power supplies, and all the other things that you'll need.

Tks
Rick