OCing ram on X570 + Zen 3 worse than Intel?

[Morgoth97]

 Greetings,

 

I recently acquired a 5900x out of sheer luck and paired it with a refurbished X570 MSI prestige creator.

 

My ram sticks are:

memory: 4x 8 GB Samsung B-die 

Model number: CMR32GX4M4C3466C16 version 4.31

XMP profile:

Frequency:3466 MHz

Primary timings: 16-18-18-36

Voltage: 1.35v

 

 

My x299 OC profile was:

Frequency: 4000 MHz 

Primary timings: 16-16-16-34

Voltage: 1.45 v

 

My x570 OC profile is:

frequency: 3666 MHz 

Primary timings: 16-16-16-34

voltage: 1.5v

 

I was unable to boot my system with a memory frequency higher than 3666 MHz even with loose timing such as 18-22-22-38 and turning gear down mode on; also my SoC has a voltage of 1.1v applied. 

 

My inquiry is how come my memory modules won’t clock any higher on Ryzen?

I’ve already confirmed that the infinity fabric can OC to 1900 MHz.

I’m trying to figure out if it’s the ram modules or my motherboard (perhaps likely because it’s refurbished) or just bad IMC on my CPU because I’m considering buying another set of better binned ram and repurposing by old set of ram for a friend’s build (I’ve already given him my x299 parts but he’s yet to acquire ram). 

[Guest]

Ryzen memory controller is a bit more picky than Intels. 

Try 2 sticks only in slots A2 and B2.