hi all i have a gigabyte GA-B75M-D3H rev 1.1 motherboard with 2 x 4gb kingston kvr 1333 i have a extra crucial 4gb ddr3 1600 1.5v CL11 and a samsung 4gb 1Rx8 pc3 12800U -11-13-A1 can i combine the two different memorys with my kingston 8gb or maybe one of them to have 12gb ram or rather only the 2 kingston ram sticks?