I recently took the plunge and updated my BIOS in order to take advantage of resizeable BAR. I had been on 1302 for a very long time because the last time I tried to upgrade I experienced random idle reboots with Error 41 reported in Windows. I did a whole lot of research on the topic to educate myself on how to hopefully resolve this issue.
After a successful BIOS update, it booted fine with stock settings @ 2133 MHz. Next, I enabled DOCP set to the XMP memory profile of 3600 MHz. With that, I was getting random reboots shortly after booting into Windows. I expected that based on my past experience and knew about needing to tweak the CPU SOC voltage. With automatic settings, CPU SOC was at 1.08V. After tweaking with it a bit and experiencing a few more reboots I settled on 1.05V and it was SIGNIFICANTLY more stable. However, I'm still experiencing an idle reboot every few days but only when the machine is idle. I tried to increase memory voltage from 1.35 to 1.375 but I'm still getting idle reboots. I've read more online about other settings under Extreme Tweaker near the CPU SOC like VDDP, CCD, IOD as well as upping the memory voltage a bit more. I wanted to ask in this forum what would be the best course of action to try to resolve this? What settings should I try to tweak and in what order? What is the best way to control for variables so I know which setting is causing the instability? Thanks in advance for your assistance.
Crosshair 8 Hero - BIOS 3402
AMD 3900X (Purchased on Launch Day)
G.Skill 3600 C16 B-Die (F4-3600C16D-32GTZR)
Silent Scone@ROG wrote:
After updating, are you using an OC profile that was saved in the UEFI from the previous build? If so, wipe the profile and start over.
How are you testing memory stability?
Silent Scone@ROG wrote:
Memory stability should be tested with HCI MemTest or Karhu RAM Test. OCCT Memory test is also fairly good.
Go into the AMD Overclocking Menu in the UEFI, select Curve Optimiser and select a positive value of 10. See if this helps.
I noticed that your fclk is locked to your RAM. That may be the reason your system is not stable. You may try one thing.
Unlock the fclk manually by lowering it to say 1600MHz see if your system is stable.
If so, then I believe the problem is the clock of your infinity fabric. So, you may either unlock the fclk to a lower frequency, or try to increase the VSoC to boost the infinite fabric.
3900X is an "older" generation. It may be more difficult to get 1600MHz in your infinity fabric. It is kind of silicon lottery.
Hope this helps.
BTW, I have a 5800X and I have overclock my 3600 RAM to 4000 and my Fclk is locked to 2000 MHz. My system is very stable so far.
For me it was PBO Fmax. Disable it. My 3900x is now stable. Same CPU/Board/Memory speed