Supported Ram on Motherboard

Solution
It will run at 2133Mhz by default. You can go in to the bios and set the XMP profile to 2666 or use overclocking settings to get the ram to the 2666 speed.
I see. So if I got 2666MHz ram, I would be able to change it to achieve that speed in the BIOS? Is there a reason the motherboard is set like this by default? Seems kind of odd to me.