x399 taichi multiple issues w/ videos

Configuration is Asrock taichi x399, BIOS L3.32, Ryzen Threadripper 2950X, GSKILL F4-3600C17Q-64GTZKW (4 x 16GB samsung b-die, XMP rated to 3600MHz 17-19-19-39 2T), EVGA GeForce GTX 1080 Ti FTW3, Samsung Pro 950 512GB NVME SSD, Samsung Pro 850 2TB SATA SSD, ASUS MG279Q Monitor (27" 2560x1440 144hz Freesync model, IPS panel)

The Fail Count setting has been fixed on BIOS L3.32 so that is good.

I am unable to create a video about UEFI resolution stuck at 1024 x 768. For me, it may be a hardware configuration incompatibility as loading UEFI defaults still results in 1024 x 768. The only options for the UEFI HD resolution is "Auto" and "Disabled".

Odd CAS timing with geardown mode (GDM) disabled (Command rate 1T or 2T does not matter) with RAM speeds 2933 or higher cause NO POST at POST code 15. RAM tests known good at CAS latency 16 and 18, but no POST at CAS 17. I already know GDM on with odd CAS latency automatically rounds odd CAS timing up to the next even CAS timing (17 -> 18) Here is video documenting the issue 

RAM Speed 2866 GDM on, tests good CAS 16, 17, 18. GDM off, tests good CAS 16, 17, 18 @ command rate 1T and 2T

RAM Speed 2933 and 3200 GDM on, tests good CAS 16, 17, 18. GDM off, tests good CAS 16, 18 @ command rate 1T and 2T. POST FAIL at CAS 17 with either command rate 1T or 2T

Loading saved UEFI settings is still an issue on BIOS L3.32. Screen goes black and computer becomes unresponsive except caps/scroll/num lock keys and ctrl + alt + del to restart. It is an intermittent issue and hard to reproduce consistently. I have made a video with my experience. Here is video link of my experience  as well as steps I did to reproduce.

Load UEFI defaults and save profile 1 as "UEFI Defaults" and restart

Go back into UEFI and change settings as follow

Boot tab > Setup Prompt timeout > 10 | boot beep > On | full screen logo > Disabled | Above 4g decoding > enabled

Security tab > secure boot > enabled

h/w monitor > cpu fan 1 setting > customize >monitor m/b >  numbers from top to bottom for cpu fan 1 : 50, 55, 60, 55, 60, 55, 75, 80, 80

advanced > southbridge configuration > wan radio > disabled | bt on/off > disabled

advanced > storage configuration > sata hot plug > disabled

advanced > amd cbs > DF common options > memory interleaving > channel

advanced > active page on entry > OC tweaker

Save user default > select profile 2 > name it "test"

save settings and restart

go back into UEFI > load user default > select UEFI defaults > results in black screen. sometimes it comes back, other times it stays black screen unresponsive.

also there is another issue. setting "Above 4G decoding" causes POST hang on code B2 and beep code 1, pause, 3 beeps, 3 beeps, unless secure boot is manually set to enabled as well. requires cmos reset to restore working state. see video here.

I have not had the time to test Rtt resistance settings, and software tools used to read that setting have not yet been updated to be compatible with the 3.xx series of BIOS/UEFI.

I have not yet re-tested P-state overclocks, partly due to new second generation threadripper and precision boost overdrive replacing p-state overclock for me.