In reply to the article concerning PCIe bandwidth from Mar 26th, 2010: http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/ This article has been the only one I've found searching Google that adequately tests PCIe scaling. My question is about GTX 580 SLI. This review concerned a single GTX 480, but as lemonadesoda and Formula350 discussed on its thread, I'm not convinced SLI has the same yields. A follow-up article for the GTX 580 under SLI would be awesome. Regardless, what does anyone think the performance difference is between two GTX 580 in SLI @ 8x compared to 16x? I've been looking at P67 motherboards and Gigabyte's UD7 is the only one that does SLI @ 16x.