I have an Intel DX48BT2 mobo, and i was wondering what type of RAM i could use in it. It only has 4 SLots for the memory so is triple channel out? I already have 2 x 1GB sticks of DDR3 in it now, and i want to upgrade to 6GB. So can i just buy 2 x 2GB sticks and put those in? do they have to be the same company? Thanks.