I just ran it on my E8400+GTX260 and got 2724 on high and my card should get lower results. Here is a few possibilities that could explain those results:
Benchmark utility is not compatible with SLI
The 8800s are 512MB and with AA/AF, the memory gets saturated
The game is optimized for fewer cores, greater clock speed would be preferable, have you tries OCing?
Have you tried other benchmarking utilities to rule-out the FF benchmark being crappy?