Ok just set this board MEG up with a 1900X temporarily till the 2950X is available and it appears broken on the bios level. 1900X seems locked at 3800MHz and 1.4+ volts with no XFR and will NOT down volt or down clock in windows with balance power plan enabled. There appears to be nothing I can change in the bios that rectifies this issue of the cpu being "locked" in this 3800MHz 1.4+ volt mode.
And all the reviewers didn't pick up on this OBVIOUS flaw, faaaaark me, how well do they test things out. What now? Blowed if I want to run this system like this constantly.
BTW, tried both bioses 1.0 and 1.1 and same problem.
1/X399 MSI MEG - 2950X + Vega 64 Custom WC - G.Skill 4 x 16GB DR b-die @ 2933MHz - 3 x 1TB Intel NVme M.2 + 1TB & 500MB SSD - Silverstone 1500W - yay
2/Z390 MAXIMUS XI GENE - 9900K/Corsair H115i Pro + 1080Ti - G.Skill TridentZ F4-3600C17D-32GTRZ - 2 x 1TB ADATA SX8200 Pro M.2 NVMe - Seasonic 1300W Platinum - yo