CPU-Z showing 1066 mhz on 3000mhz DDR4



hello man.

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cpu = i7 7700k
ram = 1 stick "CRUCIAL BALLISTIX TACTICAL 8GB 3000MHZ DDR4 CL15 DIMM BLT8G4D30AETA" (pretty sure thats what it was).

Also i dont think my cpu running on 4.2ghz , can i check somehow?

Here is my cpu on cpu-z

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and ram on cpu-z

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i just want to be sure my pc using all that i can get out from cpu/ram etc