This video isn't interesting because they're using the SR-2 mainboard, but mainly because it's a head-to-head comparison of 4-Way SLI and Crossfire-X. You can clearly see that both architectures provide less performance in one area and more performance in another area. Must see!

Running the 3D Mark Vantage Benchmark on the SR-2 Motherboard, using 4 way CrossfireX and 4-Way SLi for comparison.