https://www.gigabyte.com/Motherboard/X470-AORUS-ULTRA-GAMING-rev-10#sp
- Support for DDR4 3200(O.C.) / 3000(O.C.) / 2933 / 2667 / 2400 / 2133 MHz memory modules
What O.C. means and why only 3200 and 3000 have O.C.?