Hello, guys. My motherboard is ASUS M5A97PRO and i have 2 RAM sticks 2x4 GB Kingston HyperX 1600 MHz.. I need 4 GBs more. But unfortunately Kingston HyperX is not more available in my country, hence i'm thinking to buy Kingston HyperX Fury 4 GB 1600 MHz.. But then i will have 3 sticks. Does my motherboard support Flex Mode or all of them will run at single mode?