I just got my hands on a Mac Pro 1,1. 2x3.0GHz Dual Core Xeon 5160's 2gb ECC FB DDR2-667 X1900 XT w/512mb 3x250gb HD's So I've already thrown 16gb ram in it, a 120gb SSD for the boot disk, and two X5355 Quad Core CPUs. What's left? Well of course, the old graphics card! I will be using this for pro apps. The only reason I bought it was because I got it for a steal of a price at $200. I have an i7 hackintosh and a few G5's as well. The question is what's the BEST GPU that can be used with the old school PCIe 1.1 bus for pro apps. I know with 10.7.5 I can use any nvidia GPU 5 series or earlier that's PCIe. Will a GTX 560 give me the same level of performance out of pro apps (Motion 5, FCS 7/FCP X) as something older but originally made for pro apps like a Quadro FX 4800? Any insight on this would be fantastic. The X1900 isn't a bad card its just quite outdated. Can anyone give me an NVIDIA card to compare it to that has about equal benchmarks? I'm having a tough time finding good benchmark data for it that is relevant to my searches. Thanks!