Troubleshooting memory

[Scary_chicken]

Hello,

I recently upgraded from my good old Crosshair VI Hero with a 3700X to a to the Crosshair VIII Hero with a 5800X. I downloaded and installed the beta BIOS v2402 listed by Asus and bought this memory kit to pair it with 16GB G.Skill Trident Z Neo DDR4 PC 3800 CL14 KIT (2X8GB) 16GTZN NEO.
I just found out about this thread and will download the beta BIOS here posted and give it a try. Nonetheless, I would appreciate it if I can get any comment on my issue.

My problems are the following:

- Using both my old kit (TridentZ 3200 CL14) or the new kit (TridentZ Neo 3800 CL14) I test with CB r20 and get scores that are around 5800 MC and 620 SC. Maximal MC boost goes to 4.4-4.5 reaching temperatures in average around 85 C and CPU core voltages around 1.35V. Under these conditions I get 0 errors as monitored unsing HW64 Info.

- When I use the TridentZ Neo 3800 CL14 running at 3600 CL14 or CL16 (using DRam calculator safe settings) leaving FCLK in AUTO or manually setting it to1800 generally results in a fail to boot status. Only after turning off the power and unplugging PSU, however, sometimes it will boot with these settings still saved into windows. When I manage to get into Windows and test with CB r20 immediately I get "Windows hardware errors" usually between 20-40, specifically listed as "CPU/Interconnect" and both CB r20 scores (MC and SC) plummet.

- When using the TridentZ Neo 3800 CL14 using DOCP leaving FCLK in AUTO or setting it manually to 1900 I get over 200 of these errors.

- Finally, by clearing CMOS and now setting memory speed to 3600 MHz (not DOCP) and leaving everything else in AUTO, I don't get problems booting into windows but still get the errors of the CPU/Interconnect. Under these conditions the motherboard sets automatically the FCLK to 1800.

My question is, could this be a problem of getting a faulty 5800X, a motherboard issue or a BIOS problem?

Any input is highly appreciated.

My system:

Ryzen 3 5800X, Crosshair VIII Hero, 2x8GB TridentZ@3200 CL14, Asus Strix 2080 ti OC, Corsair AX1200i, Kraken X62 V2, case Enthoo Luxe Tempered Glass

[njbongo]

This is just an observation, but you mentioned manually setting the FClock to 1800 with your 3800 Ram. You SHOULD try setting it to 1900, as you want a 1:1 ratios between the memory and Infinity Fabric. I See you also tried "AUTO" which should attempt to run the FClock at 1900.

According to a Gamers Nexus Video, AMD's official statement to them was "many of the Ryzen 5000 series CPUS will have no problem reaching 2000MHz FClock for DDR4-4000 speed memory, although we can't guarantee it". They also stated future AGESA version should make this easier, and more stable. But for now, their "official recommendation" for the sweet spot is 3600MHz memory.

I have a 5600x, because the 5900x sold out in seconds, paired with Trident Z NEO, 3600 - CL14 memory and have no issues.

For now, I would try manually setting FClock to 1800, and the memory down to 3600, and see if that is stable for now. Then wait for the next AGESA Bios to get released.