Originally Posted by Spartoi
I get a 3b Q-code error when I try to set timings to 16-16-16-16-38.
What is you DRAM voltage? you'll have to make sure to put the advertised voltage for your kit, in my case 1.35V.
Also, make sure to set your VDDSOC to at least 0.95V as it helps for memory training.
Some of the more guru guys here will tell you 0.95V is not much and you could go to the 1.15V but I'm kind of trying to keep my voltages as low as possible.
If 0.95V VDDSOC, and 1.35V VDRAM works, then after you can try lowering your voltages step by step, but make sure to first run some memory stress test to make sure it works.
You can find more details about memory stress testing for Ryzen in this post: http://www.overclock.net/t/1628751/official-amd-ryzen-ddr4-24-7-memory-stability-thread
Let me know if it helps, I'll also edit my post to add information about the voltage.