Benchmarks: Encoding, Cinebench & Kribibench
On to the multi-threaded tests.
Encoding
Move along, nothing to see here.
Video encoding's slightly more demanding, so performance differences emerge, albeit small ones. CROSSHAIR sits marginally in front, two seconds faster than the slowest board, ATI's Sturgeon reference.
Cinebench
Sturgeon fares better in Cinebench, taking the number one spot, with CROSSHAIR a close second. The M2N32-SLI Deluxe came out as the slowest in this test, although its score is >99% of the Sturgeon board's; very little difference, really.
Kribibench
nForce 590 SLI appears to trump nForce 570 SLI in Kribibench, although it'd be unfair to make that claim with just one motherboard representing 570 SLI. CROSSHAIR, M2N32-SLI and Sturgeon all yield very similar performance results, clearly making the most of CPU and RAM.
It's going well for both ASUS boards so far, then, with very little between them.