Anything more than 8gb is pretty much useless unless you're doing video rendering, cad software, photoshop, running a server etc... For gaming 8gb is all you should need. By the time games/software reaches the point it needs even close to that much (if it ever does) it will be probably at least 5 years from now and by then your ram will be outdated. Not sure why so little is usable, the mobo might only support 16gb max, windows 7 or 8 64bit should use it all but that's besides the point.