Mixing 2 sets of rams in asrock x79 extreme 9


Jan 7, 2012
I am currently running 4x 4gb of ripjaws X 1600mhz cl9 ram in my X79 board. Even though they are 2 sets of dual channel from my Z68 board, they work fine in quad channel.

However, I need to add more ram and my hsf is block the first ram slots on both sides, which means I can only go lower profile ram.

If I were to get another set of ram, say g-skill or kvr 1333mhz cl9, will my ram still run in quad channel, just at 1333mhz. Or will it totally not run?