Judging by this article http://www.anandtech.com/video/showdoc.aspx?i=2284 SLI 6600GT's consistantly outperform a single 6800GT (both on the same mobo) by a good margin. However, when AA and AF are turned up, the 6600GT's lag behind, probably because of their smaller bandwidth. With these stats in hand, how would you expect a 6800GT in a slower nforce 3 mobo and an AGP8X slot to do against SLI 6600GT's in nforce 4 and pci-e? Thanks again for listening. This being said, I am faced with a dilema. The 6800GT pci-e is a better card for most applications, and I could conceivably upgrade it to dual 6800GT's farther down the road. However, dual 6600Gt's perform very well, and it is my guess that they will be able to handle most applications for quite some time, not to mention the fact that I have not seen a pci-e 6800GT priced at lower than 480, compared to around 360-400 for dual 6600GT's. I figure by the time I have enough money to buy another 6800GT, there will be some newer high end cards out and I will want to replace it. For these reasons I am currently leaning towards an SLI 6600GT setup. Any advice is welcome!