Thanks for the feedback. I did end up getting it going by installing smcfancontrol and using DiabloMiner.
Oh so you were able to control the fan in OSX! Smcfancontrol in unable to control both my GPU fans but they are both PCIe GPUs.
In smcfancontrol do you see a fan specifically for the GPU or because of the iMac design it's just the CPU fan cooling both chips?