UPDATE - Solution It looks like AGESA AMD BIOS version Patch B (1004 B) fixes the Nvidia pass-through D3 errors for folks with x470 and x370 Ryzen AMD motherboards.  This patch was introduced in late November 2019 to AMD motherboards.  Mobos confirmed working after updating to this BIOS version: * Asus Prime X470 Pro + 3900x * MSI B450 Gaming AC * MSI x470 Gaming M7 AC + 2700x * X370 Taichi + ryzen 3900x * Gigabyte AX-370 * Asus x470-F with 2700x and 39