May I ask why you need 12GB or ram?
I have 6GB of 1866mhz running in mine.
i7 920 @ 4.0GHZ..
Also, I may be wrong, but I think no matter what the speed is, it will default to BIOS.
If the boards BIOS is 1333MHZ, then the 1600MHZ should run @ 1333MHZ by default.
My 1866MHZ ram when not overclocked, is @ 1600MHZ.
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