Originally Posted by Muppet
You don't need to use the bridge for SLI. It will result in lower performance though.
This is actually untrue. For 3 Way SLI. A bridge is required. And for 6 way it would be even more mandated. The reason being is PCIE bandwith may be enough ((albeit slower)) to drive 2 cards in AFR mode. The more GPUS will greatly increase the latency required for SLI operation and would end up causing a serious performance deficit.