Just wanted to point something out to everyone.... If you upgrade to the 8800GT, DO NOT sell the card you are replacing. Why? Because the Leopard install DVD DOES NOT SUPPORT the 8800. The GUI will NEVER start. I figured this out last night. I wanted to get a clean start, however I was unable to even get the install DVD to boot. It would crash before the GUI started. Reinstalling the ATI X1900 allowed me to get the OS reinstalled, and updated to 10.5.2 before I was also to put the 8800GT back in. AppleCare has no solution for this. The current retail Leopard DVD is STILL 10.5. The current mac pro's ship with 10.5.2, but the installer will not allow it to be used on the older Mac Pros. The major issue is this. My father had his 8800GT installed at the Apple Store, who kept his 7300 (which was failing anyway). I have no want of doing a clean install on his box, unless I keep my ATI. I was planing on selling it. So far, AppleCare has told me that I will have to wait for a new Leopard retail Refresh, then buy a new copy. Is it just me, or does this seem a bit wrong?