I got my first mining rig setup recently and have a few questions for the experts. I am running two Sapphire 7950s. They come OC from the factory at 925 MHz. and dish out a decent hash rate of near 500. I am using MSI Afterburner and have been playing around with overclocking. At the factory settings GPU1 runs at about 80C and GPU2 70C. It appears that the exhaust from GPU2 (the bottom card) is heating up the card on top (GPU1). Question one, how does overclocking come into play other than the clock speed of the GPU? Do I need to do anything with the GPU memory clock? Question two, what recommendations do you guys have for bringing down the temp of GPU1? Right now I'm just using a box fan with less than stellar results. Link to a pic of my rig is below. Thanks for the help!


https://docs.google.com/file/d/0B_suVvn6l4j2YU0wOEx2NlVNTlk/edit?usp=sharing