Genocidicbunny
Bug squasher
Im im not sure i uses more than 2 cores. And the bottleneck in that game is definately your graphics card. Its "interesting" to see a 500 card cant run it on highest settings with decent fps. Triple SLI might do though i think that is crazy from a heat and energy perspective (> 1KW power adapter anyone?).
Crysis can be run on High settings just fine with a 6400+ and a 8800 GTS. There's no need to dump money into SLi unless there is money to be dumped.