CPU-Z and my RAM

Essej Sniggoc

Honorable
Apr 26, 2013
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I have a MSI FM2-A55M-E33 motherboard. I have 8GB of Corsair Vengeance 1600MHz. In the motherboard's BIOS I have 1866MHz selected as the RAM's frequency. In CPU-Z, it tells me that the RAM is running at 1600MHz. Can anyone tell me why this is happening?

Thank you for reading.
Any help is greatly appreciated.