I am using the ASUS P6TD Deluxe motherboard and G Skill F3-12800CL7T-6GBPI memory. That will take care of three of the slots (one set). Down the road if I want to fill the other set of slots, can I use completely different memory (different brand, size, latency timing, etc.)? In other words, as long as each stick in the set is the same, can the two sets be different from one another?