The introduction of the Socket AM2 platform will also change the current cooler specification, forcing the cost of a new thermal solution on those Socket 754/939/940 folks willing to upgrade. The change does not affect the maximum dimensions of the mounting frame, nor the cooler, but it redefines the clamping mechanism. This is no issue for the big players (system integrators and OEMs), but enthusiasts might have to throw their existing high-end cooling solution out of the window.
We were able to install a simple Socket 939 cooler, which should be possible with some products that are around. However, any cooling solution that has to be screwed directly to the motherboard definitely cannot be used any more, as there are now four rather than two mounting holes. Still we hope that high-end cooler vendors will offer modified mounting kits for their premium products.