Folks, I just bought a 2x2.66 1st Gen Mac Pro (4GB RAM, 2x750GB Seagate 7200.11s as a RAID 0 Boot drive) and upgraded the nVidia 7300 to an ATI HD 3870 with an Accelero S1 Rev 2 cooler (see pics of my install of that cooler at the end of the "Is your 3870 always loud?" thread.) Then I wiped the RAID 0 boot drive and did a clean reinstall of 10.5.6 and all my apps, with the card in place. The Pro sees it, everything "works", but where is this Core Image wonderkind I heard so much about? When I minimize or maximize windows to the dock, it's quite "choppy." I can't believe that this Mac Pro is somehow too slow to push smooth graphics, when the 7300 was much smoother in these animations. Even in Google Earth, with 3D buildings turned on and looking at Manhattan, it's like a slide show (1-2 frames/sec). System Profiler tells me that the card has everything enabled (Quartz Extreme, etc.), but when I did the 10.5.6 install, I DID NOT install the ATI driver disk (I thought the drivers in 10.5.6 would be newer). Did I make a mistake? Should I install the ATI CD regardless? Some advice would be very much appreciated. Thanks, John UPDATE: I did go ahead and reinstall the driver disk, and things seem a little smoother. However, there's no updated driver (or any driver) on ATI's website for the Mac 3870 - sup with that?