9300mGPU + 8600GTS?

i am building a HTPC and was looking at a board that has a 9300 mGPU with HDMI out. I am going to be doing a lot of encoding on this pc. i have a 8600 GTS laying around and was wondering if there is a way i can install the 8600 GTS and still use the HDMI out while taking advantage of the 9300 and 8600 for CUDA based encoding?