how big is the case you're using? I dont know of any specific 437 heatsinks but I'm sure one can be modified to fit, a low profile heatsink perhaps and a 92mm fan maybe? I know the PBGA437 was created so that it was quiet and small though so overclocking it and getting an aftermarket heatsink really wasn't the idea of this design, kinda like throwing in 5890 or a gtx 480 in there. I'd say if you're just using it for basic tasks, just lower the voltage down to somewhere in between the 1.6 and 1.86 and the stock cooler should be fine. You might be able to even attach or mount a 92mm fan onto the stock cooler if you need it.