Some update to ASUS M5A99FX PRO R2.0.
Apparently BIOS might get stuck on "Extreme" VRM setting which keeps all phases on. Newest Bios and proper checking of the setting may resolve the issue. Bad thing is that these boards may be subjected to faster aging due this, good thing that the CPU was usually not on that high load.
To improve thermals on VRM i replaced R9-290x with a watercooled FuryX, NB is not overclocked in my case, so i safely reduced NB voltage to stock. Because NB and VRM share cooler, it improved stability and VRM thermals under load.
Because the CPU isnt able to go above 3800Mhz reliably it wont me much an issue.
--- Building in progress
* AMD Threadripper 1900x * Asrock X399M Taichi * Radeon VII * Gskill Xflare / Samsung B-die 3200 14-14-14-32 * Samsung 970 PRO 512gb * Fractal Design Node 804 * Seasonic Prime Ultra 850 Titanium *
--- Desktop * AMD Phenom II x6 1090t @ 3,8GHz * ASUS M5A99FX PRO R2.0 * Gigabyte R9 FuryX * A-Data XPG 2.0 / Elpida Hyper MNH 1866 @ 1600 6-6-6-18
* LSI 9211-8i / Raid 0 / 5x Corsair Force 3 GS * Creative Xfi Fatal1ty * Intel I210-T1 * Steelseries 6Gv2 * Logitech MX518 * Samsung U28E590D *