I have eVGA GeForce 8800GTS 640MB GDDR3 PCI Express installed in my media center. And due to the lack of an attractive media center platform, the Zalman 160HD, C2D 2.4GHz is setting beside the TV turned off. So, I thought it is wise to get benefit from some components for my other applications. The mentioned card above is slower than 8800GT 512MB, which is sold for Mac Pro. My main usage of Mac Pro will be: 1. Photograph management using Aperture. 2. Photoshop editing. 3. Multi-instances of Parallel VM running Windows 2003 Server, Sharepoint and VS2005 development. 4. So far, no video editing. 5. No games. My questions are: 1. Is this card compatible with Mac Pro ? 2. Is it faster than ATI HD2600XT ? 3. Is it cooler than ATI HD2600XT ? 4. Is the extra video ram worth it ? 5. Overall, if you don't have answers, does it worth to do trial/error on installing the card or the ATI is just fine for my applications ?