I have been researching this and I have came up with no answer. There are note book heat spreaders available http://www.newegg.com/Product/Product.aspx?Item=N82E16835207003 and I was wondering if it will fit in an iMac. Yes I have looked to see how cramped up it is in the memory slot, but I found on the sunbeamtech website that the thickness of the total heat spreader is only .2" at the opposite side where the memory plugs in at. Also I found out the the thickness of the copper on the heat spreader is only .4mm thick which is very very minimal. I have just purchased one of these to test out with the 8GB ram I just purchased for $120 from newegg with a $20 mail in rebate!!!