I am about to order MacPro 2.66Ghz/2Gb RAM tommorow with stock GeForce 7300. I won't wait another 3 weeks for X1900 and anyway is way to expensive. Now I have ATI X800 in my PC and suits all my gaming needs. So for MacPro I am currently thinking on getting ATI PowerColor Radeon X1800 GTO/256Mb ram. Based on benchmarks card is even better as X800 and it costs only 180 EUR (compared to >300EUR for X1900/512Mb). Also card is noisless in idle based on reviews. Since my monitor has two inputs I'll just switch the input for OS X/XP. Another alternative is GeForce 7600GT/Noisless (also 170EUR) which has NO fans and has similar benchmarks! So with it Macpro should be almost silent I guess... AFAIK it should pose no problems for either to work in MacPro in WIN XP?