

You'd need to overclock your bios to get 1600 mhz. This is the default setting that most motherboards are set to as long as your Ram can atleast support 1333mhz. BUT standard setting for all DDR3 sticks is 1333 which is JDEC standard. Clearly, you can see my ram is 1600 mhz from the name. this is what CPU-Z spits out in memory, nothing relevant to the actual RAM's Speed.

This is the Ram I own: Kingston KHX1600C9D3B1/4G. This is Aspire V5-552P-7412 laptop specs from the actual Acer website, they did not provide the information and Ramhound is correct, there is no possible way to get that information from just opening anything in windows.
