I initially had 4 2gb RAM DDR3 cards in my computer. My motherboard and CPU is a quad channel i believe so i need all 4 cards to be the same. I bought (2) 8gb kits DDR3 1600MHz so in total i now have 4x4gb cards. When i put them all in and turned on my computer and opened task manager it still says that I have 3.9 gb available of ram and am in use of 2.9. Nearly all of my Ram seems to be hardware reserved so i have no idea what to do at this point. It says i have 16gb but i can't use any of it