I have an Asus P8b75-v motherboard and 4 sticks of g-skill sniper ram. they are 4 gigs each and all the same type. Until recently everything was fine, but suddenly only 8 of 16 was being used. I figured one of the 2 older sticks were bad so i had them RMA'd. I got the new replacements yesterday and put them in and still no 16. After extensive testing i have determined with absolute certainty that all 4 sticks work and all 4 ram slots in the motherboard function. Yet for some reason I cant get more than 8 gigs to work. The bios is updated to the most recent, and everything was working fine until a couple weeks ago. Im completely confused and would really appreciate any help.