I have just got a 27" iMac mid 2011. When they first came out they must have had Snow Leopard on them unlike the new Mac Mini's. Lion is fine but I wanted to put Snow Leopard on a partition. Copied my Snow Leopard install from a 2006 MacBook Pro and it works but Geekbench reports it running slow. (just like the people trying to get Snow Leopard running on the new Mini's) I know it doesn't install from the DVD but I thought a transfer from 10.6.8 would have worked? I presume the factory installed Snow Leopard at the launch of these iMac's must have run fast?