Short story = I noticed taichi x370 uefi found a set of timings different from ryzen_ram_calculator, So I tried it with instant success, post, windows, gaming, cold boot, hot boot. Always OK, no more intermittant sometimes work or not.

Long story start

After update bios to 4.7, for sure going to TRY overclocking the ram, first step check to see if 4.7 can jump from 2933mhz to 3066mhz easily. Answer is no. 

Luckily there's a ball-park-parameters from previous intermittent success (always lasted short few days). This allows the BIOS to fail, retry, train, fail, retry, train, etc etc etc. The usual 3 tries training set in uefi. Finally it post success at 3066, only after one session of failure (containing 3 training) but then windows still failed. Next reboot fail F9, b2, 55, whatever. And more reboot plus training etc. 

While going into UEFI setup running at 3066, I notice my parameters are gone. On the timings left column appears groups/combinations of parameters/numbers which I have not seen before. They are not ryzen_ram_calculator values in my settings and not the 2133Mhz default jedec spec. 

So I quickly write them down, and input them, with correction to tRFC, tRFC2, tRFC4, because it didn't train, it was stuck at tRFC=312 for the 2133mhz. So I replace them using values of the ryzen_ram_calculator, see picture: -

I tried to get these so called taichi self trained values on 3200mhz, but haven't seen, even though my current 3200mhz timing are touch and go. i.e. post mostly but windows fail.

Oh, btw, the original CAD_BUS Block ohms are 24,24,24,24 but didn't post for 3200mhz, then tried 20,20,20,20 also didn't post, but 30,30,30,30 post nearly always ok, just windows fail always. Still looking for the stable always ok setup for 3200mhz.

EDIT UPDATE 3rd July 2018 EDIT UPDATE 3rd July 2018 EDIT UPDATE 3rd July 2018 EDIT UPDATE 3rd July 2018 

thanks for posting your info and thoughts cx5

i still think the am4/taichi is stuck with really wanting them samsung b dies to work nicely though

maybe a few more bios versions needed

incidently ive literally just posted off my old kit

gskill tridentz 3200 cl 15 to a buyer after upgrading to 3866 tridentz (they dont work at 3866, but seem stable enough at 3466 cl14)

im still not upgrading to later bios yet , to be honest im a bit afraid of the work involved resetting everything for 'uncertain' gains

keep up with feedback on bios 4.7 though mate

you're absolutely right on the samsung b-dies......... 

and to be honest, I was looking for ways to sell off my corsairs for some gskills, but no action yet......

cas increase from 2933mhz 14-15-15-15-34 to 3066mhz 16-21-21-21-52, is just crazy, even though finally found a always bootable gamable 3066mhz, where voltage of 2933 was just 1.328v versus 3066mhz at 1.378v, in the long run is just not worth it......

Unless 3200mhz could be achieved, but still at what sacrifice of latency ???? the end answer should be still not worth the power, heat, etc. So I'm just doing it for fun. 

as you know the better option should be the lower latency at 2933 for most applications if not all

i would say in your case better to stick with the cl14 rather than trying anything faster with silly high latencies

in other news i now have a vega 64 to match yours (powercolor red devil vega 64) , but its a bit hungry for my psu so running it on silent bios at the moment (low power) and *gasp* ive removed my overclocks for this week until new psu arrives  

tony = stock ram and cpu