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Journeyman III

5950x Cache Hierarchy Error

I have a new system built and running seemingly well, apart from this "fatal hardware error" which has popped-up at least twice (maybe more). 

Admittedly, I have another PSU coming from Corsair that will hopefully fix a 5% to 10% reproducible startup issue where the PSU has to turned off and then on before the system can power on.  Hopefully the cache hierarchy error I'm posting here now is a result of the PSU, but I thought I should mention the cache hierarchy error regardless.

The latest occurrence of this error resulted in all my current work halting as the system powered off/on by itself.  This happened in the past as well but I wasn't sitting in front of the computer when it happened.

My System Specs:
CPU - AMD 5950X
CPU Cooler - LianLi Galahad 360 AIO
Mobo - ASUS ROG X570 Crosshair VIII Hero Wifi (latest bios: 2502, XMP-Enabled (DOCP DDR4-3603 18-22-22-42), FCLK-1800MHz, PBO-Enabled, PBO Max CPU Boost Clk Override-200Mhz, Windows Power set to Ryzen Balanced (and Ryzen Performance, previously I think))
PSU - Corsair HX1200
UPS - Cyberpower 1500VA (100% charge)
RAM - G.Skill Trident Z Neo 3600 32GBx2 C18 (my motherboard is listed on the QVL) part# F4-3600C18D-64GTZN

All the latest drivers are installed, including the latest chipset drivers from AMD (not Asus).

Please advise on how I can resolve this issue, its been eating into my work productivity.  I've since set PBO and PBO Max CPU Boost to Auto and set Windows Power to Ryzen Performance to ensure adequate voltage or whatnot.  I'd very much like to be able to run this chip at its fullest capacity as I've invested in significant cooling (9 120mm fans including the 3 that are pulling on the AIO radiator).

Here's some detail from the error in event viewer:
Source: Microsoft-Windows-WHEA-Logger
Date: 11/19/2020 3:46:06 PM
Event ID: 18
Task Category: None
Level: Error
Description: A fatal hardware error has occurred.

Reported by component: Processor Core
Error Source: Machine Check Exception
Error Type: Cache Hierarchy Error
Processor APIC ID: 0

The details view of this entry contains further information.
Event Xml:
<Event xmlns="">
<Provider Name="Microsoft-Windows-WHEA-Logger" Guid="{c26c4f3c-3f66-4e99-8f8a-39405cfed220}" />
<TimeCreated SystemTime="2020-11-19T23:46:06.1955831Z" />
<Correlation ActivityID="{a292dcc3-5fa1-49ae-b6ff-cc1349f2e997}" />
<Execution ProcessID="4780" ThreadID="5744" />
<Security UserID="S-1-5-19" />
<Data Name="ErrorSource">3</Data>
<Data Name="ApicId">0</Data>
<Data Name="MCABank">5</Data>
<Data Name="MciStat">0xbaa0000000030150</Data>
<Data Name="MciAddr">0x0</Data>
<Data Name="MciMisc">0xd01a0ffe00000000</Data>
<Data Name="ErrorType">9</Data>
<Data Name="TransactionType">0</Data>
<Data Name="Participation">256</Data>
<Data Name="RequestType">5</Data>
<Data Name="MemorIO">256</Data>
<Data Name="MemHierarchyLvl">0</Data>
<Data Name="Timeout">256</Data>
<Data Name="OperationType">256</Data>
<Data Name="Channel">256</Data>
<Data Name="Length">936</Data>

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