I needed an additional MEG B550 Unify-X board to install in the M2_4 (PCIe 3.0 x4) slot, so I went ahead and purchased one. Has some pros: The RAM is good for PCIe 3.0, and the height of the components allows for normal cooling to occur under the radiators that come preinstalled with the motherboard (unlike the 2 TB version). Some cons: Recording speed: judging on the numbers that were revealed, as well as comments and reviews, I was anticipating a higher rate.