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I don't believe the board supports 1600 memory. You should use 1333 220.127.116.11 at 1,5v. You can use one stick but it won't be running in dual channel mode. It would be better (faster) to use 2x 2Gb sticks. I use 2x 4Gb DDR3-1333 Mushkin Silverline and it scores 7.6 in WEI.
thanks for the help