I have 2x512 corsair value ram sticks which are installed in dual channel mode. Now if I want to run my ram and max speeds wich I guess is 400 mhz what do I set my memory speed at in the BIOS. I set it and 400 mhz and cpuz said my sticks are running at like 220 mhz and is I set it to 200 mhz it say it running at 160 mhz. What is going on?