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Ryzen 7 3700X idles at 50°C, fails prime95.exe blend test >100°C

Question asked by vivraan on Aug 1, 2020
Latest reply on Aug 3, 2020 by vivraan
Computer Type: Desktop, Custom build.
GPU: RTX 2070 Super, GDDR6 8GB, don't know whether SLI/Crossfire
CPU: AMD Ryzen 7 3700X, no varying overclocking settings.
Motherboard: MSI B450 Tomahawk Max
RAM: 2x16GB Corsair something - RAM supports DDR4-3000MHz 16-20-20-38 A-XMP, and defaults to 2133MHz-15-15-15-36 - A2 and B2.
PSU: Provide the model number and its rated output level.
Operating System & Version: I.E. Windows 10 Pro Version 1909 , Ubuntu 17.04, etc.
GPU Drivers: NVidia GeForce Game Ready 451.85 hotfix.
Chipset Drivers: AMD Chipset Software 2.07.14.327
Background Applications: Chrome, Unity or Godot Engine, File Explorer
Description of Original Problem:
With or without OC, irrespective of undervolting VCore to 1.35V, the idle temperature is always 50-55°C, spiking 60°C (2-6% utilisation, Chrome in the background) can easily reach 85°C during heavy load, and has recorded doing a 100°C in some HWinfo64 logs which were made while performing benchmarks.
I haven't tested the temperature during gaming, but I feel a warm breeze at my feet. Restarting the CPU solves the stuttering temporarily. Even the second monitor blacks out for a second at a time.
Now coming to the prime95 torture tests: Blend testing without changing any settings crashes the PC (HWinfo64 logs reveal overheating towards the end) within 3 minutes, but applying A-XMP seems to solve the monitor blackouts, and the PC works okay on the Small FFT and Large FFT tests reaching 85°C.
I have the latest AMD Chipset drivers installed as well. Should I change the thermal paste or cooling?
Troubleshooting:
EDIT: Tested Outer Worlds, goes between 77-83°C.
EDIT 2: A-XMP DOES NOT SOLVE BLACKOUTS.

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