Hi, i am using AS Rock H55m-LE motherboard, i5-650 processor. I am experiencing problem with RAM. I am using apacer 2GB 1333MHz ram, works fine with it. I decided to change then to 4GB. Bought new kingston KHX1600C9D3/4G , 4GB ram , 1600MHz. Removed old one and putted kingston. Windows is not loading, it starting to load , freezes, restarting and writing problem with instaled hardvare. It wont even allow me to instal new OS, same error, problem with new hardware.