Hello,
Your memory will have a frequency rating, 1333Mhz, 1600Mhz, 1866Mhz...
Check the part number on the sticker and post it here.
Most kits provide what is known as an extended memory profile (XMP), this is a programmed spec which you can use by simply enabling the option in your BIOS. <This would run the memory to the max performance settings.