I have also a question about that. I have a 5850 and a 5770 in a mobo Asus m2n-e sli. It has 2 pci-e slots so I can plug both cards but when I use the miner it only shows me the first one and in GPU-Z only the card that is in the primary slot has OPENCL. There is some way to use both to miner? At least I will have to use only 5850 but it would be great if I could use both.