I didn't buy a motherboard/CPU combo. The Athlon I bought came packaged with a heatsink/fan -- if that's any help. This is what I purchased: http://www.newegg.com/app/View...esc....-103-390&depa=1
The documentation did not state various ways for various heatsinks, all it said was "Note: Your heatsink may vary in appearance from the heatsink illustrated," which you can probably guess didn't help much.
This is a heatsink that has the three-hole retention clips that mine has:
This is a heatsink that has the indentation step that prevents the sink from touching the socket that my heatsink does not
And here is a [bad] drawing I did in paint (since I searched for a while on the net and could not find one like it) of the heatsink/fan that came with my processor:
Since it has no indentation step, I'm not sure if it is fitting correctly and I am afraid to try anything until I know that it is possible to get the thing fitted and in proper working order.