Q: Yeah, i know its oldish, but how much of a performance drop would i get by using the 4870x2 with a pci-e x16 slot, not the 2.0
A: Possibly significant drop at high resolution but may not be noticeable at low to moderate resolutions. PCIe 1.1 bandwidth may not be the only potential bottleneck. Processor at default speed below 2.66gHz could be another bottleneck. Benchmark your set up with 3D Mark then compare the results with the ones here: http://www.extremetech.com/article2/0,2845,2327866,00.asp http://www.extremetech.com/article2/0,2845,2327867,00.asp Then, tweak/OC processor and/or graphics card to find out if you could squeeze some more performance gain.