Mac Pro/NVidia 8800 GT: poor performance, graphics glitches - MacFixIt
Curious behavior from this card. It's around $300 and has 512 MB ram.
Poor performance As noted in a posting by Bare Feats, the Mac Pro's stock Radeon HD 2600 XT beats the GeForce 8800 GT in a number of pro appliction benchmarks. The publishers say: "We're puzzled by this when you consider it has twice the VRAM and a faster core. Could the Radeon's architecture be more optimized for Core Image effects?"
[From Mac Pro/NVidia 8800 GT: poor performance, graphics glitches - MacFixIt]