sharp910sh:
It would! the 8800gt is about 20 % or so faster, while sli can be up to 50% faster, so two of these would be faster than the 8800 gt
Looking at the raw specs and not doing too much resarch, it appears there's a bigger jump than 20% between the GS and GT, and "up to" 50% really could mean anything.
Then again, it depends which GT it is being compared to.