I used this http://www.frozencpu.com/products/7038/thr-41/Innovation_Cooling_Diamond_7_Carat_Thermal_Compound_-_15_Grams.html

I also used Arctic Clean to clean up the huge mess first. You want to put a small drip of compound on each chip. They say pea sized on the instructions but I used a little less for each chip since they are a lot smaller than a CPU.

I have had it running stable for 3 weeks now with no temp rises.

I had tried Arctic silver first but that didn't help at all, the Cooling Diamond was like night and day and has been working fantastic.