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Gah. Got the stock cooler off, reached for the fitting instructions for AM3 and I can't find them. AM2 and AM2+, and K8 yes,
MX3. And what's wrong with the MX4? Or do you not yet know about it...
Because I'm an idiot.
Will swap it round tonight.
While you are re-seating it, you should fill the grooves between the heatpipes on the contact surface of the heatsink with paste. (Unless you have already done this.).