It's gigabyte a320mI have the same CPU.
Its not all that bad really. Do you run these kind of burn tests all day?
Your PRD reading is about 82% under full load.
Your CPU is max its PPT, at around 95W (78/0.82=95).
Its default figure is 88W so its not too far off and cant really hurt the CPU. Max operating temp for Ryzen 3000 is 95°C.
You can try to update the board's BIOS to the latest and also enable "Snapshot CPU Polling" from HWiNFO main settings (right-click system tray icon).
Also use a balanced windows power plan from the windows power settings.
If you want to test these things use a more real life applications like Cinebench R20/R23 CPU and Unigine Heaven4.0 or Superposition for GPU.
FurMark is known for its stress test brutality (especially on GPUs, and P95 for CPUs) and I'm avoiding running it.
Depending on the board's BIOS settings it could have some settings so you can try to set it closer to 100% (PRD). See if you can find any CPU telemetry settings in BIOS
What brand/model is the board?