Compatible Mac Pro graphics cards?

Basically I want something under $400.

Probably to be an nVidia.

Must work on the Mac pro.

I think the best ones out atm are the ATI 2900XT or the Nvidia 8800GT. The 8800GT blows the 2900XT away.

Mmm. I'll check it out.

I believe that you have to get the 8800GT with the mac pro, and not buy it seperatly. I Can't seem to find any drivers anywhere for it

http://www.apple.com/search/store/?q=Nvidia+GEforce

won't open the product for some reason...

Hmm just goes back to the main page.

http://store.apple.com/uk/product/MB560Z/A

try that
or if you have a 2008 one then
http://store.apple.com/uk/product/MB137Z/A

Yes, you cannot just by any old graphics card; it must be one made especially for the Mac Pro.