ddr4 ram 2400 mhz showing up as 1200 mhz

I recently bought 2 new ram sticks of 8 GB ram 2400 mhz in total, when i check my cpu-z it only reads as about 1200 mhz. Seeing as i cant enable xmp profile on a dell inspiron 5675, idk how i can g

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A-TECH 16GB (2x8GB) DDR4 2400 M Hz UDIMM PC4-19200 (PC4-2400T) CL17 DIMM non-ECC

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SOLVED] - my ram is 2666mhz and showing task manager its 2400mhz

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A-TECH 16GB DDR4 2400 M Hz UDIMM PC4-19200 (PC4-2400T) CL17 DIMM 2Rx8 non-ECC des