Is task manager accurate?

Acidity

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Aug 9, 2015
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I recently purchased hyper x 16GB 1886mhz RAM.. In the bios it says that it's 1886MHz but task manager says its 1333.

CPU Z says 933.

I'm confused, I know speed doesn't make the biggest difference in the world... But id just like to be sure it's working at the speed they advertised.

Motherboard: Z97 PC Mate
CPU: i5 4690k
GPU: R9 390 Sapphire nitro