Just wondering if you guys could do a test regarding PCI-E performance with todays latest GPU's and maybe the golden 8800GTX? This is a pretty hot topic around the web and no1 is really sure if for example a GTX280 or 4870X2 is limited by the older PCI-E x16?
We did such a test for the German print magazine some time ago, but actually the test didn't contain cards like the GTX280/260 or the HD 4870 X2. Nevertheless we learned, that a Geforce 8800 GT(S) (512 MiByte) receives a benefit from the PCI-E 2.0 slot if the video memory is full. A GTS (320 MiByte) on the other hand can benefit about 10 to 20 percent from overclocking the PCI-E 1.1 slot to 130 MHz.
We did a Crossfire comparison with a P45 (2 x 8 PCI-E 2.0 lanes) and a X48 (2 x 16 PCI-E 2.0 lanes) motherboard. Here we saw that the X48 board was about 45 percent faster in Crysis (1,680 x 1,050, high details, 2x FSAA/4:1 AF)