I am playing FO4 on a Gigabyte 990fxa-ud3-r5. I have 16 gigs of memory(4 times 4GB) and the game maxes the memory out and crashes. I want to buy some 8 GB sticks but cannot find anything but server memory that has no heatsinks installed. Does anyone know if I should/can install a couple of sticks of 8GB memory alongside a couple of sticks of different timing 4GB memory?