I have a Gigabyte GA-H55M-USB3 Motherboard and an i5-760 CPU. I have been using 4x1GB DDR3-10600 modules, and then recently bought 2x4GB DDR3-10600 modules hoping to get 10GB, however, I can't seem to get it to work. All the modules are in working order and work individually. I currently just have a single 4GB module in. If I insert more, I either get a constant bios speaker tone indicating RAM error, or it will post successfully, but Windows will bluescreen. I have looked in the booklet and it is unclear as to how I should install the modules, but I thought I had to install them in matched pairs corresponding to the coloured slots on the motherboard. I have tried the 4GB modules in the white slots and the 1GB modules in the blue slots, but it won't post. Putting the two 4GB modules in a white and blue slot will post fine, but BSOD on startup. Any idea how I can get this configuration to work with my board? My CPU and board both support dual-channel DDR3 memory, so I can't see the problem here.