I have the same issue . . .
Ryzen 1700x clocked to 3.90
gskill ddr4-2400 2x8gb
B350 msi tomahawk mb
CPU-Z shows 1199.7MHz (2400) on each stick of Ram and shows the correct voltage and clocks. (15/15/15/35)
Task manager still shows default 1067MHz or 2133
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