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10 May 2009  

Vista X64 ultimate/ 7 X64 Ultimate (7264)

It might be a problem with the board seeing the 3 sticks as it's trying to run 2 of them in dual mode.

Look in your bios and see if there is a way to disable dual channel on the memory.

If this doesn't work then you might well have to either drop down to 2 sticks permanently or buy yourself another stick so both channels can run in dual mode.
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