A while ago i haver read that ATI is asking for motherboard company to make motherboard with a 3rd PCI Express slot. Its it for this? http://www.pcpowercooling.com/products/viewproduct.php?show=TC1KWCF As in Dual Gpu is not enough the need to add a 3rd. As for Sli they go for 4. So there will be viturally no place for any other pci slot. But any how Quad Sli uses how many PCI Express slot? Since we are at it i wonder currently which is better CrossFire or Sli. And is it worth it to invest in a dual gpu system. Since most mid motherboard comes with sli or corssfire. Will 2x 7600GT better perfrom 1x 7900GT or 1x 7900GTX? And will 2x X1600XT perform better than 1x X1900XT or 1x X1900XTX? If so what are the performance ratio compared among them? Anyplace in the web where they already compared it?