So i have 3 pcs. of rams. 2x Team elite 4gb ddr3 1600 mhz and 1x kingston 4gb ddr3 665 mhz. If i'd use the 3 of it, my ram will only have a max of 665mhz but in 12gb. But if i use only the 2 1600mhz, i will have a 8gb with 1600mhz. The question is what's better?