Slim142 STOP BEING PATHETIC !! AND RMA YOUR BOARD !!!
I have told you three times now to do this but you just won't do it do you?
You are like those old people that are always complain over there deseases and pain, just to get attention, and never seeing the doctor.

There are enough users with a SIIE that run SLI like a charm, so seems like your board is faulty, learn to live with it or RMA the damn thing.
But please stop asking and thinking and trying , and DO something !
Hope I shaked you awake now