I mine with my iMac using poclbm in Windows. I've overclocked the core clock to 870 MHz and underclocked the memory to 300 MHz. I've also increased the ODD fan speed so that the GPU temp stays stable at around 60 C. It doesn't always run 24/7, I give it a rest now and then. I want to know, is this dangerous for the computer? As in will it's effects start showing soon?
