You're going to have to spring for better cooling, or a different mobo if you don't want to sacrifice performance, unfortunately. Those cards will cook each other like that.
There it is, 98% Load = 85C with 58% Fan speed. What a difference.
I am sending the x58 sabertooth back and ordered Rampage III Formula.
My question is, where can I get such a long SLI cable to connect GPU1 which will be in the top PCI express slot with the GPU2 which will be in the very bottom PCI express slot?