Confused about (OC) label for memory on mobo specs

I'm really confused about this.

I'm considering the ASRock Z87M Extreme4, which says "Supports DDR3 2800+(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066".

Someone once told me that if any memory with speed labeled (OC) is installed then the mobo needs to be overclocked to match the memory.

Is that correct? Looking at the ASRock manual, the DRAM Tweaker seems to automatically recognize each module which suggests 'manual' overclocking wouldn't be necessary.

With that in mind, other than cost, is there a reason **NOT** to buy DDR3-2800 over DDR3-1600?

Thanks for any clarification!
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  1. Best answer
    its labeled as overclock because the default clock speed of the memory controller on the intel cpu's is 1600 and any faster ram causes the memory controller to be overclocked when you choose the apropriate xmp profile.
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