Yes, the card, PSU, and motherboard will work fine together. Be aware though, that the motherboard is PCI ver 1 and the card is ver 2. No big deal, just that the card will only run at the slower 2.5 GT/s speed of PCIe ver 1.
They'll play nice together, though and do n't worry about the PCI-E versions, the 9800 is nowhere fast enough to suffer any performance drop with PCI-E 1.0.
Just a little question; are you planning on gaming with this system?