i had 2 (4gb each) sticks of ram g-skill ripjaws x @1866mhz and it was working as it was supposed to. i added two more of the exact same ram giving me 16gb all together however now its only running at 1600mhz and not the 1866. is this a issue or is it not a big deal? i use windows 7 64bit, MSI GD-65 Gaming MOBO and i7 4770k