Have internally tested GSkill and Corsair without any issues. I would generally advised getting a validated kit for the Z77 platform with that in mind i have tried Quad Channel kits as well without problems. Keep in mind in some situations the IMC may not fully support some higher frequencies ( in my experience this is generally more common for 4GB 2400 and greater frequnecies ). In your situation considering 8GB dimms it places even more stress and may not always be compatible or stable. Overall though you should not have issue with 1333 or 1600.