You wrote "I have already installed 8GBs of 1600Mhz DDR3 RAM on the mobo, and it detected both 4GB sticks and so did Windows, but those were my brother's sticks, I used them to test how more RAM affects BF3 performance." Since you already tested 8 GB of DDR3 memory and it worked, why are you worried? Just buy a set of modules that are compatible (or that you know will work) and be done with it. Bear in mind that you can't install both DDR2 and DDR3 memory modules at the same time - doing so would damage the motherboard (and probably the DDR3 memory).