Hey guys, just popped a second pair of 4000MHz HyperX Predators on my MSI Gaming Edge AC and the board REALLY doesn't like them at pretty much anything above 3500MHz. Initial pair solid @ 4Ghz @ 16GB but can't get a second pair to be stable and happy @ 4GHz. Does this require a different mobo or are there any settings I can get all 32GB stable @ 4GHz? I know about the 'non-optimised' slots, is that unique to this board or Z390 chipset in general? Cheers!