I have a kit of two modules 2x2gb ( kingston 1600Mhz Hyperx Blu) . I want to have 8 gb of ram (same memory ram type) and overclock them at 1866 for my AMD A8 6600K . If i add one module of 4 gb , my system will be stable with 3 modules ? ( 2x2gb and 1x4gb) , or the number of modules doesn't matter in a system ??