So this is for a new build. The last time I built a computer Windows xp had just came out. It was pretty easy... but now that I have decided to build another computer I am seeing all sorts of new issues (I was also not as much of a researcher before). So I chose this memory http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=154009 AND this motherboard http://usa.asus.com/Motherboards/AMD_AM3/M4A89GTD_PROUSB3/. I didnt know until after I made the purchases that there were such things mobo and RAM compatibility issues other than what type of RAM it is DDR3 or DDR2 and what is its native frequency relative to what the mobo supports. This mobo can run 1600 mhz memory and has the capacity to fit 4gb of RAM in each slot. I knew Corsair is a good brand which is why I went with it. I thought 4gb was a good starting amount so I went for that as well. After look on corsair's site though this particular 4x1 ram stick does not show as compatible... I noticed that almost although the rams listed were in combinations of 2x2 4x2 and so on. So, will this memory work? I mean it says its made for all DDR3 motherboards with 4 slots? I have ddr3 ram capability and 4 slots so what is the problem?