selphie wrote: However, the problem is, when I cold boot the rig, sometimes it reboots once or twice, then continues into Windows, and sometimes it reboots 3 times and then goes to default 2133 RAM speed :'( . I read about this issue here and wonder if this is affecting ASRock boards as well: https://www.reddit.com/r/Amd/comments/64wxqi/asus_prime_x370_lack_of_dram_training_voltageboot/ Does anyone have insight if this is true that the AB350 K4 board is booting at 1.2V before loading the manual setting of 1.35V? If it is, it may be what's causing memory training to fail during booting stage, quite a big oversight!

If true, which I don't believe, JimmieG from the link fails at considering/addressing not only(assuming) might the mem voltage be low BUT also possibly booting at 2133 JEDEC. His is speculation only. and rather loose one at that as I debunk/describe here.

Did I make that understandable there? I sux at that sometimes.

Since updating  1.0.0.6a  I am able to get all 4 dimms at 2400, its a step in right direction for me since ive never been able to enable XMP profile up until now. ive tried 2666,2800,2933 only works XMP 2400


my system specs are below

Ryzen 1700 -stock frequency-

32gb

CORSAIR Vengeance LPX 8GB 288-Pin DDR4 SDRAM DDR4 2666 (PC4 21300) Desktop Memory Model CMK8GX4M1A2666C16R

asrock ab350 motherboard

Thanks Wardog, I understood that :)
Will keep that in mind and try increasing some voltage a bit to see if that helps with the cold boot issue.

My Evga ddr4 3000 auto-sets itself at 16-16-16-35 on ab350m even though I manually set the timings in Advanced cbs. also, it won't stay set to 2T command rate. The reason I wanted to try 2T is because my trc is 66 and trfc is 491 and I wanted to see if command rate made a difference to those settings. When I manually try to set trc and trcf, it just goes back to the 66 and 491. I've got 4 8GB sticks OC'd to 2800 seemingly stable at 1.30V along with ryzen 1600 3.8ghz at 1.29V so I'm not complaing(yet), but I'm a little confused about trc and trfc. The RAM's XMP default settings are 15-16-16-16-35-51(trc=trp+tras). I know stability is only compromised if the trc or trfc is set too low but does anyone know what effect the high trc and trfc will have on performance with it being at 66 and 491?

mksinha76 wrote: also, it won't stay set to 2T command rate.

what do you mean saying "it wont stay" ? If it works with 1T it should also work with 2T and use that setting.

If you set it to 2 and the setting is not used make sure you have GearDown mode set to disabled, otherwise the CR setting is automatically set to 1.

I would say you can consider GearDown mode as CR 1.5 , so:
fastest setting: CR 1 , GearDown disabled
medium setting: CR 1 , GearDown enabled
slowest setting: CR 2 , GearDown disabled

Edited by BoneCrusherXes - 23 Jul 2017 at 7:10pm