I'm sorry if this is bad form, but I'm in a similar situation and am confused with the options. I've got the same motherboard and right now I'm running 3x2g modules but want more memory. Can I just buy two pairs of 4g modules (DDR3 1333mhz) and not use that 4th module? This would double my memory but I'm not sure if it would actually work like I think/hope it would. Thanks!