When I was playing Battlefield 4, I was lagging a ton, so I went into dxDiag to figure out what the problem was, come to find out it says I have 4gb of memory, yet I have 8gb in my computer, any solutions? I've looked up solutions but I can not find any that have worked for me. My motherboard is a Gigabyte and I my ram is a ripjaws but I can't figure out which kind, sorry. Any help would be appreciated, thanks!