I'm about to purchase a P55 system (i7-860) that I do not intend to overclock. Motherboard specs from Asus and others show memory above DDR3-1600 as "O.C." but 1600 isn't listed this way. Isn't the nominal bus 1333? Why isn't 1600 listed as OC?
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Because you don't need to overclock the memory controller.
I don't understand. Would there be a need for 1600 on a non-OC system?