Here is part of the E-Mail that one of the NVIDIA engineers sent Legit Reviews and all other review sites.
There you have it folks... Conformation of what we already knew... The timedemo in Crysis sucks and isn't realistic.I've been testing Crysis quite extensively over the past few weeks. It turns out that the benchmark_GPU isn't quite good at measuring graphics due the speed of the camera moving across the map. It causes a lot of data streaming and ends up reducing SLI performance by 15-20%.
The more accurate way to test Crysis is to record your own timedemo and play them back. I recorded a few timedemos on the island map and performance is much better than what is reported by the benchmark.
The ice map is also very good for testing graphics due to its lower CPU utilization.