I've planned on using my tried and true stepped MCW6000 on a socket 939 system for a while now. It does work perfectly fine for the Athlong 64 as I understand it. The only issue is that the stepped version is thicker than the flat version so you have to modify the mounting hardware.
I hadn't thought about it not fully covering the IHS like Bill had mentioned, but I was planning on removing the IHS anyway to help compensate for the increased thickness of the block. Removing the IHS is a quick and easy mod that has the potential to net a drop of a few degrees.
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