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location on the mobo. Bad news, though. In your case with 939, there
are two bolt-through holes on the sides of the CPU. Unfortunately for
you on AM2/AM3 there is one hole in each corner. So even though the
CPU should be in the same location, you will probably have no way to
bolt down the cooler to a new mobo. If there's some way to clip the
heatpipe instead of bolt, you might be able to make it work?

Since cost is an issue, I think an add-in card for your existing mobo
is going to be your cheapest and easiest solution.

Another option would be putting in a modern mobo, deleting the
heatpipe, and sticking a low profile fan on it. With CPU throttling
and active fan control, noise shouldn't be an issue for a FE-only
since any time it is on, you're watching TV which is going to mask the
minimal amount of noise a temperature-controlled fan is going to make.
Assuming you get a mobo with VDPAU support, the CPU isn't going to be
doing much anyway so the fan should stay pretty slow.