its only the ultra that requires two seperate cards and with that they recommend atleast a 480w power supply. I just read a little up on your card and with the 128 you got basically the lower end of the 6800 family (lower still meaning kick ass though) but yeah, they say 300w recommend, I'd lean towards getting a 420w true power supply especially if you have other junk running. Right click on your desktop, go to properties, then go to settings, then at the bottom right click advanced, then click the name of your card and see if it says that you're running at AGP 8x and that it says 128mb memory. memory should be fine but definitely make sure its running at AGP 8x, I accidentally had a card in PCI Mode once =/ Just some suggestions. Also make sure your graphics aperture size is correct in your BIOS. 128-256 will be good