This question from Andrew Burford came in for ExtremeTech editor, Loyd Case:

Is a system armed with an AMD Athlon 64 X2 4000+ CPU, with 2GB of PC6400 DDR2 memory and a GeForce 7900GS, sufficient to play Crysis in medium detail?

Loyd's reply:

You didn't mention your monitor's native resolution. Your system can certainly run Crysis at medium detail at 1280x1024 or lower, and you'll get reasonable frame rates most of the time. I wouldn't run it at higher than 1280x1024, though.