I just built a new computer and started with 8GB of memory. A few weeks down the line I purchased another set of the same memory because it was on such a good deal and had great reviews (newegg). It also was working well for me, so I figured maybe more could be better.
I haven't noticed any decrease/increase in system performance except Alt-Tabbing has recently got slower. Also, Windows 7 was sitting tight on 1.3gb to 2gb of memory usage prior to the extra 8 (now 16) being added. Even when gaming, it went up to like 3gb. Now that I've added the extra it's going up to 4.5gb or better. Why so? Also, is it possible to speed up my alt-tabbing? It seems to have a good 3-4 second pause in it instead of being immediate like it was.
Windows 7 HP 64-bit
gSkill 16gb 1866 memory (BIOS shows it at 1866, too)
Intel i5-2500k Sandy Bridge (OC'd 4.6 with factory Overclock presets)
ASRock z68 Extreme4 mobo