I've been an Nvidia guy since 3dfx went under, so no crossfire here, but I've never run SLI either. I don't see the need unless you're playing the latest fps games at max resolution with all the visuals cranked up. If and when I get around to building this HTPC I will probably switch and go with ATI because their HDMI cards are measurably better than Nvidia's. It'll still be a single card solution though.