Benchmarks: ScienceMark and HEXUS.pifast
The core logic of the boards on test is the same, so our benchmarks should simply validate if the boards are well constructed, and whether one of the boards is better configured.
ScienceMark
M2N32-SLI and CROSSHAIR both yield similar memory bandwidth scores, CROSSHAIR edging out in front in the first of our barrage of tests.
Conversely, it is the M2N32-SLI that has the lowest latency, according to ScienceMark. The two nForce 590 SLI boards rule the roost.
HEXUS.pifast
Pifast relies heavily on the CPU, thus the results are very close. However, it also utilises RAM somewhat, so the winner in our bandwidth test is also the quickest at the HEXUS.pifast run.