for me,the heatsink depends on the quality, some use normal double sided tape only.the heat trapped inside the chips itself,make it even hotter and kill ur rams even faster. good quality ones will hv real thermal tape to transfer heat to the metal heatsink. but nothing beats allngap ram cooler in my opinion.just tht more noise due to the fans only.

http://forum.lowyat.net/topic/732591/+60?hl=ram%20cooler.... refer post #64..thts my ram cooler i bought from allngap