a single 9800gx2 should work fine as you have a PCI-E 16x lane slot on the board.
1 x PCI-E 1x slot
1 x PCI-E 16X slot <---- that's the only one capable of using a graphics card as nearly all need a minimum of 4 PCI-E lanes
2 x PCI slots
its a Nvidia G...
1 x PCI-E 1x slot
1 x PCI-E 16X slot <---- that's the only one capable of using a graphics card as nearly all need a minimum of 4 PCI-E lanes
2 x PCI slots
its a Nvidia G...