The performance of these two chipsets using a single graphics card is almost identical and you can expect SLI performance to be much the same. The nForce 590 SLI chipset does provide slightly more memory bandwidth, though this does not seem to aid its real world performance all that much. The nForce 590 SLI is also a much better chipset for overclocking as I have tested a number of nForce 570 SLI/Ultra motherboards here in the Legion Hardware labs and none of them have cracked a 266MHz FSB without loss of stability. Ideally, for this article I would have preferred to use two motherboards from the same manufacturer. Unfortunately, I did not have time to wait for an ASUS M2N-SLI Deluxe sample.