Ryzen 2600X memory controller.

[chrcoluk]

Added 2 dimms today, Had to go down from 3000mhz CL14 to 2800mhz CL16 for stable system. I guess the early ryzen chips really did suffer for memory performance.

Still it is outperforming asrock's own claims in the board manual where it states max speed for 4 dimms on ryzen+ is only 2400mhz.

 

[chrcoluk]

For original zen its even lower, the manual states 2133mhz, 1866mhz if dual ranked.

Summit Ridge 2133mhz 4 SR dimms
Summit Ridge 1866mhz 4 dimms that include any DR dimms.
Pinnacle Ridge 2400mhz 4 dimms, or 2133 if DR dimms.
Raven Ridge is similar to Pinnacle but drops to 1866 again for 4 DR dimms.

These are clearly conservative numbers though, Raven maxes out at only 2933 for a single SR dimm, and Pinnacle Ridge says 2666 for 2 SR dimms, when I was getting 3000.

I am on 1.0.0.4 AGESA thingy, I looked into 1.0.0.6 which has reported improvements but backed off due to some posters on here saying they had regressions.

 

[chrcoluk]

Built a couple of 2600 or 2600X (can't actually remember which it was) systems with 3000MHz CL16 RAM on AX370 boards which run fine with 4 dimms populated - I literally just enabled XMP settings and a couple of clicks and worked fine.

I had a lot more trouble trying to set the RAM up manually but using XMP just worked (which is the opposite way around to the Intel builds where XMP is usually unstable or sub-optimal and I have to manually dial it in).

Interesting, I enabled XMP, karhu ram tester failed within 3-4 seconds, the fastest i ever seen an error popup. Whilst I was researching, the idle system blue screened. Research yielded a bunch of people on reddit saying max speeds if you have lottery winner memory controller was 2933mhz on 4 dimms. I didnt research much past that point so granted there would be perhaps others with different experiences, I still errored out at 2933, went down 2 steps to 2800 and was fine, I did try to tighten timings at 2800 but it didnt post. At 2933 karhu did take longer to get an error, but was still very fast at about 30 seconds or so.

At 2800 it survived 3 hours of karhu and 3 hours of hci so am satisfied it will be stable.

In case board has an impact the board is a asrock b450 pro 4.