Hello everyone. I have Asus P5k Platinum mobo with IP35 chipset + 8800GTX. I know that the second PCI-e slot only runs at 8x, but was wondering, since none of the cards can even fill the bandwith of an AGP slot if 8x is not enough to push SLI? Will it be noticably sllower vs 680i? Not even worth it unless I get new mobo?