Have a old assus desktop has 1 pc3-12800 8 g stick ddr3L operating at 1.35v would like to add another but finding most are the 5volt type. can i mix the types or need both either 5 volt or find another ddr3l which am having difficulty doing . Motherboard is CM6330_CM6630_CM6730_CM6830_M11AA ivy bridge H61