I have a XFX Nvidia Geforce 9600 GSO with 768 MB of Gddr2, with PCI Express 2.0 580 MHZ SLI Ready. It was part of a bare bones system from tiger direct. I had to replace the PSU once and I believe its maybe 430 Watts of Power. I doubt I spent more than 30.00 on the PSU. When I take my video card out my pc it boots up fine and it runs off the onboard 8200 nvidia. But as soon as I plug in the XFX Nvidia Geforce 9600 GSO and then connect the power from the card to the PSU it shuts off. The whole system just shuts off?? and it wont start again untill I remove the power cord only from the card. Also,, can I use DDR2 instead of GDDR2,,, whats the diff. Thanks in advance peeps. any help is greatly appreciated.