Everybody in the gaming world long enough knows about it: SLI. Or…Scan Line Interleave. A technique found in 3Dfx graphics card. By combining two cards (then there was no AGP, just PCI) and connecting them, card 1 could render the even scanlines and card two could render the odd scanlines, and combined it would create the whole image. At higher framerates, or at higher resolutions.
NVidia reintroduces SLI with its PCI-Express based GeForce 6800. Tom has an extensive article about it, and things are looking good. NVidia has lost some ground when ATI started making very competitive cards again, but I guess they’re going to reclaim some land!