Looking for a CPU cooler for a old Asus A8N-VM mainboard (Socket 939)

Hello,
I am looking for a recommendable CPU cooler for a old Asus A8N-VM mainboard (Socket 939).
It should be rather silent - max of 30 dBA.
I tried a Scythe KATANA 3 SCKTN-3000A, but the cooling fins of the onboard GPU are rather close to the socket, so I could not use the locking mechanism of the CPU cooler without damaging the fins.
Now I am trying to find a silent CPU cooler that will actually fit the motherboard.
Anyone can come up with one?

The mainboard
http://www.asus.com/Motherboards/AMD_Socket_939/A8NVM/
The CPU cooler where the locking mechanism did not fit
http://www.scythe-eu.com/en/products/cpu-cooler/katana-...