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  1. #11
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    PSS support is the new name for the Cool'n'Quiet technology on AMD cpus.

    This technology makes the CPU cores go into the C6 sleep state when idle, and the SOC and CORE electronics are then stressed by the continuous fluctuations in current and clock frequencies due to the voltage changes when in this deep sleep state.

    More than once disabling it promptly solved random reboots issues or stabilized an overclock. The drawback is that the CPU cores will never reach the C6 sleep state and only use the C1 sleep state, so they would use a bit more watts when idle, also it is suggested to keep the PSS support disabled when overclocking.

    The C6 sleep state on the AMD Zen3 is quite aggressive, you can try to re-enable PSS support and you may observe in HWInfo64 that some cores will lower their voltage to nearly 0.2v when entering the C6 sleep state, the SOC interface for that core will also be put to sleep during the C6 sleep state period. It is this constant fluctuation between 0.2v and 1.4v that sometimes may cause a core to fail when exiting the C6 state.

    If you can confirm that that setting solves your issue, then I would say that the issue is caused by some VRM/Voltages fluctuations. You may want to try to increase your LLC, switching frequencies and power phase controls in the BIOS to see if that compensates (you can get the stable settings using the Ryzen DRAM Calculator) and allows you to re-enable the PSS support. You may also want to set the BIOS AI Overclock Tuner to Manual instead of DOCP so to avoid some weird interference with your voltages.

    Your issue may also be solved by a future BIOS update as the VRM calibration logic is in the BIOS.

    Also, you can put your SOC voltage back to Auto. If it is the PSS support that is causing the issue, the increase in SOC voltage is unneeded.
    Last edited by Kelutrel; 02-01-2021 at 12:22 AM.

  2. #12
    ROG Enthusiast Array chrismog2_2 PC Specs
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    Interesting, thanks for that. But I'm still seeing some fluctuating values for C6 Residency for every core except cores 1 and 2 in HWiNFO. Does this setting also correlate with the Global C-States setting, or do they both need to be disabled for this to be fully effective?

    Running out of time to test further today, but I'll dig back into it tomorrow.

    edit: after a reboot just to make sure I still had PSS support disabled (I did), now cores 2 and 14 are at 0% C6 residency, the others are bouncing up and down as needed.

    edit #2: secondary effect, all of my CPPC preferred core numbers are now set to 1, instead of ordering 1-16 as they used to. So each core in the list says (perf #1/...)
    Last edited by chrismog2_2; 02-01-2021 at 12:49 AM.

  3. #13
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    Quote Originally Posted by chrismog2_2 View Post
    Interesting, thanks for that. But I'm still seeing some fluctuating values for C6 Residency for every core except cores 1 and 2 in HWiNFO. Does this setting also correlate with the Global C-States setting, or do they both need to be disabled for this to be fully effective?

    Running out of time to test further today, but I'll dig back into it tomorrow.
    Uhmmmm... you are right, I am pretty sure that with previous BIOS versions disabling the PSS support was also disabling the C6 state but I verified now that with BIOS 3204 it looks like there is still C6 residency when the PSS support is disabled.

    If you can reliably confirm that your issue is solved by disabling the PSS support anyway then there is no need to do anything else. Global C-State or VSOC would make no difference. But you should be reliably sure that that setting solves the issue, so maybe put everything on Auto or as you prefer, and just keep PSS support disabled and use your PC normally as you would do for a couple days to confirm it is now fully stable. If not, try to disable Global C-States too.

    I wonder what changes with BIOS 3204 when disabling PSS support then. If you ever understand what it does now please let me know (it used to be described as "PSS Support = AMD Cool & Quiet C6 Mode").
    Last edited by Kelutrel; 02-01-2021 at 12:49 AM.

  4. #14
    ROG Enthusiast Array chrismog2_2 PC Specs
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    I found this image on an old post explaining the PSS Support items:
    https://imgur.com/a/nti5lLu

    And now, strangely, after a cold boot this morning, none of my cores are hitting C6 at all. Only change I made was to set SoC voltage back to auto. May or may not have time to run more gaming tests today, to ensure the problem is resolved.

  5. #15
    ROG Enthusiast Array chrismog2_2 PC Specs
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    It's been a few days... I returned my VSOC to auto on Monday, but couldn't do any gaming testing until today. System's been stable otherwise, doing basic desktop work and all that... but that has always been the case, so it's not a big indicator of anything. Gaming tests tonight went fine though, roughly 90m of a grab-bag of tasks within FFXIV, including some tabbing out to open other apps + letting the game idle for a bit. I'd hesitate to call it "fixed" after just two data points but it is a big step in the "more stable" direction at least. I also installed the newest chipset drivers off the support page for the C8F today, so there's that too.

    Assuming all goes well, I'll probably enjoy the fact it's working for a few days, and then subject myself to more frustrations "for science" by re-enabling PSS and/or rolling back the chipset drivers one by one to see if anything causes BSOD's again. Appreciate the help.

  6. #16
    Administrator Array Silent Scone@ROG's Avatar
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    Hello,

    What are you using to test memory stability?

  7. #17
    ROG Enthusiast Array chrismog2_2 PC Specs
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    Quote Originally Posted by Silent Scone@ROG View Post
    Hello,

    What are you using to test memory stability?
    This may sound silly, but just a game (Final Fantasy XIV) and a specific dungeon (one of the newest, Matoya's Relict). Because nothing else was replicating the BSOD behavior, and I could get it to reliably BSOD within roughly half an hour of play otherwise. Normal desktop behavior (browsing/installing/uninstalling, zipping/unzipping large files, etc) never had issues. OCCT, Prime95, Memtest86, Karhu RAM Test, Cinebench R23, 3DMark, etc. all passed with flying colors, for hours on end. On applicable tests I also tried lowering the thread count to 6 or 8 to simulate the max threads a game would be able to handle, and still got nothing out of it.

  8. #18
    ROG Enthusiast Array chrismog2_2 PC Specs
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    Well, after a few days of not having any issues, got another BSOD while playing the same game, roughly 30 minutes in. No dump file (main screen froze at 0% on the BSOD dump creation; sound locked in a stutter of whatever was currently playing; second monitor mostly went black except for a "negative" of some text). Completely stable all day otherwise, though it was mostly light load w/ web browsing and an RDP session.

  9. #19
    Administrator Array Silent Scone@ROG's Avatar
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    Quote Originally Posted by chrismog2_2 View Post
    Well, after a few days of not having any issues, got another BSOD while playing the same game, roughly 30 minutes in. No dump file (main screen froze at 0% on the BSOD dump creation; sound locked in a stutter of whatever was currently playing; second monitor mostly went black except for a "negative" of some text). Completely stable all day otherwise, though it was mostly light load w/ web browsing and an RDP session.
    But what is the stop code?

  10. #20
    ROG Enthusiast Array chrismog2_2 PC Specs
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    Quote Originally Posted by Silent Scone@ROG View Post
    But what is the stop code?
    Same as always, WHEA_UNCORRECTABLE_ERROR on the blue screen, but the Windows system log doesn't have a chance to record it. So it goes in as an unexpected shutdown (event id 6008), dump file creation failed (event id 161), and a crash/reboot (event id 41).

    On the rare occasions where I actually get a memory dump file, the debugger shows me it's an L1 cache read error. I've seen it on cores 12, 13, and 14.

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