Take the stock HSF off, and check whether there is paste between. Even Arctic Silver 2 component is better than nothing. If ot is glued, put the board in the freezer for 30 minutes.
I put a Blue Orb on the NB of my A7M266. But if you have a Epox 8K7A or the Giga GA 7DXR, unfortunately, it will not fit because of the capacitors around. Or more simple you can just ex-change the fan with a stronger one. The stock fans are all at not more than 2000 or 3000 rpm.