Socket 754 and 939 are the same... And socket 7 and 370... Those are the only two I think use the same config?
socket 7 coolers mostly won't fit on s370 in my experience but s370 coolers do fit socket 7, socket 370 and socket A are pretty much interchangeable. s754, s939 and s940 use the same mounting cage but AM2 is different. just get a cooler with a good reputation from s939, all the decent ones have been updated for AM2 but make sure when you buy it that it does say it is compatible with AM2
Thermaltake Big Typhoon