I believe there are 3 different retail coolers. One with no heat pipes, one with 2 heat pipes, and one with 4 heat pipes. I used the 0 heat pipe cooler on my 3000+ overclocked (and with a slight voltage bump) to 2.5 GHz without any problems. I eventually upgraded to the 4 heat pipe cooler for piece of mind, but I don't remember temps ever being a problem with the 0 heat pipe cooler. Basically what I'm saying, if you aren't running a dual core 939 chip, I would imagine the 0 heat pipe cooler will be sufficient for any single core stock volt 939 chip.