As to locke's question of whether or not these water blocks will work with the 939 AMD systems. What I have in mind is to modify either the motherboard CPU frame or the lexan top to cause these blocks to adapt to the 939 AMD motherboard systems. There are many reviews and comparisons of these Gemini water blocks. The spiral design Gemini use is well known as being a successful configuration and the blocks, performance wise, are very competitive and liked. I know that it may sound like I am trying to make a sales pitch for these water blocks but the only reason that I have for informing of the particulars of these blocks is that I am so impressed with them. After received the blocks that I had ordered recently I was floored bye the workmanship of these blocks! Simply put," Ultra High Quality at Ultra Low prices"! I have been attempting to construct my own water blocks/cooling system for a while and I could not buy a drill bit for the price that they are asking for just one block. For anyone who is thinking of tinkering with computer water cooling without having to invest a bunch this is definitely the way to go if one is lucky enough to get one at that price. I don't post often so please excuse my inexperience.