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Yes you MB will support 8GB of dual channel RAM.
From the spec sheet: x DIMM, Max. 8 GB, DDR3 1800(O.C.)/1600(O.C.)/1333/1066/800 ECC,Non-ECC,Un-buffered Memory
Dual Channel memory architecture
Your G. Skill 1600 modules aren't are the QVL, but as long as they were purchased as a pair together, you have a good chance they will work OK.