Low 3dmark can also be cause because of t high overclocking. I see that you have the memory on 8800GT a bit more then everyone here. What I would do first i try to run everything stock.
listen to this man, he knows what he is talking about.
so run that bench on stock, and compare it your bench OCed.
and for your to hit such a high OC on a 4400, whats your vcore and load temps. thats what I wanna know.