Questions-SLI performance/Driver issue

Ok, i have 2 8800gt's in SLI core clock 730/memory 1050(2100)/shader 1750
I only get 22-23fps in crysis benchie, more like 30-40fps in game 86% of the time. why is my performance so low? or do i have to high of standards?

2nd(perhaps this goes in Overclocking

My old driver
178.24_geforce_winvista_64bit_english_whql

seems to overclock better then my new one where when i OC i get less NDVK driver error if i OC then play a game also i can OC high and still remain stable

180.48_geforce_winvista_64bit_english_whql

that said with "lower" OC i never get driver errors..only little tiny artifacts.

I think my fan is set to max...every time i set my fan higher i never see..hear a difference. I was wondering if modding my VGA bios to a higher default fan speed would work....also how dangerous is it as i know if your MoBo Bios gets messed up ur kind of SOL?