Both cards work when only one is hooked up and all four dvi ports also work. I will try the ram trick when my new psu arrives (if a new psu doesn't solve the problem). Thanks for all the help. I'll let everyone know what the deal is when i get this new psu in a few days! Thanks again.
Some of the 750 boards have sli jumpers make sure those are set to sli, also in the bios you have to set it to some setting (different for all motherboards consult the manual) then when you load up a little icon appears I think in the bottom right of your screen and you have to enable SlI on that, for more information of setting up SLI go to the Nvidia page for it. I think the PSU is fine, it has plenty of AMPS and watts (if your's is the same antec 750w I"m looking at, then it has 25 amps on each of the 4 12v rails, and a 9800gtx+ only requires 26 (?)