An additional HTL multiplier (which really helps with OCing) and dual channel memory are about it nowthey are probably pretty comparable, I would say the bus speed of the 939 would make it faster though, I cant say by how much, and the fact that 939 supports dual-channel memory is also a plus, especially with that high bus speed...and ive heard that 754 is being discontinued, but I have never seen it confirmed, so I say go with 939.