Can the processor limit the speed of RAM?

Solution
No it means it will use the speeds the motherboard defaults to, normally with Intel, you would select XMP memory profile, which should set it to 1600 as that's Intel's official top speed. To use 1866, you need to set it manually.

PCNoobXCVII

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Dec 5, 2013
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Okay, mine actually set it to 1333 by default, thanks for the info dude.