1680x1050, Ultra High settings, 8xAA
I simply ran the Crysis benchmark then I changed my settings to high (overwritten from Ultra High), and I cranked up the max supported resolution and in-game AA (8x), then I ran the benchmark, after the benchmark had been complete, I then ran the game with the same settings and WA-LA
Here is my proof of the benchmark with 1680x1050, Ultra High settings, 8xAA on the bench (attatchments)
I would show proof in-game but it is common that people screenshot max settings and play with different settings, not to mention, your screenshot turns out blank.
If this isn't good enough for you, try it for yourself.
Not only the memory sharing I should be thanking, but the Crysis Benchmark too.