Jim - that's basically the same tweak as is used on VIA chipsets, just different registers and values for the AMD chipset. Same comments, same cautions. The fact of the matter is you can
NOT hurt anything by trying it. Worst thing that would happen is your system become unstable and crash. Reboot, don't do it again
CPUCool should also work with your motherboard.
PetDMC - point of reference, radiator repair shops use a heavy lye mixture to clean out radiators and heatcores. You can pick some up at your local grocery store most likely. Just be sure to hook a hose up to it (garden hose) and run pure water through it for 20 or 30 minutes afterwards if you use the lye to make sure you flush it completely out. (To clean it out with the lye, fill it with the lye mix and let it sit for 20 mins or so, shaking it every so often. But be careful, lye is quite caustic and if you get it on your skin, it can burn it. Wear rubber gloves and long sleeve shirt, avoid getting it
anywhere near your eyes, and cap the inlet/outlet when you are shaking it so you don't splash yourself with it.) You can also use the lye mix with a scrub brush to clean the outside