Changing out stock heatsink on mobo for heatsink with fan

I have an A7N8X, and one of the chips has a heatsink that I would like to
have a fan help cool it down.

One thought was to replace the heatsink with one that has a fan included.The
stock heatsink has no visible attachment point(s), so I'm taking it for
granted that some sort of epoxy or adhesive tape is holding it in place.

The other thought was to locate a fan that will easily attach to the
existing stock heatsink. This would be the more interesting way that I would
like to go, due to that I have a video card that a heatsink with no fan, but
I would like to place a fan on it also.

How can I remove the heatsink?
Or...
Are there any heatsink fans that can be easily attach to any odd shaped
heatsinks?