I think you have them the wrong way round - heatsinks cool via convection.

DDR3 is More Complexes & Future of Main computing. Why You Need to Double DDR2 Speed to Get DDR3 Better, I'm NOT Sure. Until DDR2 gets past 1,250 Mhz/s this is it already is. Even then OR Now...gibble,bibble, How Do Two Perform Head to Head.?

Seems DDR2 is Pushing up DDR3 speeds befoe latency questions are answered. Latency isn't that BIG of Deal except to Engineer. Its always 20 to 100 latency overall, with 40 to 80 so common, irregardless of few specific latency points.

Go DDR3, Go. Numbers Look Bigger, Are They? Its Complex business.
drashek