I bought 1866 mhz ram but my motherboard only supports 1600. After I changed it to 1866 in bios CPU-Z is showing it running at 1866mhz. Is it actually running at that frequency or is it being downgraded to 1600 because of motherboard limit? I have a Ga-z77 D3h with a 3570k cpu
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>>62208730
Support 1600 mean it can run 1600 only OOTB, but if you OC it runs at faster speeds
>>62208730
By setting it to 1866 you are overclocking your memory controller to make your RAM run at that speed. It works but could potentially cause instability.