You can dual psu's. It involves some minor re-wiring, but then you'll be able to use two. Some cases have two slots for power supplies. Like hte original coolermaster stacker. Until R600 is out, We won't know about the power requirements. Rumors aplenty. 8 pin pci-e, two 8-pins, 4 6-pins, 400w power cousumption.. It's just not known yet. But, if it's anywhere near the 8800's, then it should do it.