What is my ram mhz?THanks!

DDR3 memory has a double data rate. Your memory is currently running at 666 MHz, but with the double data rate that is equivalent to 1333 MT/s. That memory is described as DDR3-1333.

The memory is rated for 1600 MT/s, which is equivalent to 800 MHz. It's a simple settings change as Entomber explained.
 

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