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When it comes down to using a computer for gaming and multimedia by a user who is not planning on doing any overclocking what's the difference between the NVIDIA nForce 790i Ultra SLI chipset, and the NVIDIA nForce 790i SLI chipset?

I believe the main difference between those chipsets is that the 790i Ultra can support up to 2000mHz (w/ limitations) of ddr3 RAM speed while only 1333mHz for the 790i. My guess is that performance difference would only be significant in benchmarks but hardly noticeable in the applications you stated.