I've got 4 DIMMs of RAM (GSkill Ripjaws), they are supposed to run at 1600Mhz. When I check the speeds, my BIOS tells me that slot 1&3 are running at 1600 and 2&4 at 1333. I tried to set it manually and via XMP. Now I wonder, why aren't they running at the same speed? What can I do to make them do it?
Normally, when one of the RAM modules is running slower, the other modules should follow, so they should all run at the same speed. However, some computers set the speed of the RAM modules accordingly to what is needed automatically. This can also occur when putthing more than 3GB of RAM in a 32-bit system.