So small update on my rig, have been having blast with the games on it.
However, it seems there is a 'wonkyness' when it comes to the B650 and AM5 chipsets, but on random motherboards (or at least Asus and MSI).
Now and again my pc would, what I would call 'short circuit', i.e. everything would trip (mouse, keyboard, screen etc.) except the fans in the case which would all just go on full load indefinitely until I reset or shutdown/startup again. This seemed to happen at random, whether the CPU/GPU was under load or not - no real pattern - I just assumed at the time maybe there was a short (cable maybe) somewhere touching the case.
Yesterday, however, my PC did not want to boot up - not even showing the BIOS options etc. It would start booting, the LED of the GFX card would lite up (as well as the keyboard and mouse) but then would just die down again with no boot.
Fortunate, found someone with the exact same problem and board on Reddit:
https://www.reddit.com/r/ASUS/comments/z9sbfr/solved_asus_motherboard_b650plus_pc_wont_boot/
My BIOS is the latest stable version when I checked, so what I did was to switch my secondary HD from Sata 1 to the last one Sata port. Hey presto, now the PC at least booted correctly again.
However, when I tested the pc using 3dmark, every time during the test, the PC would go into the 'short circuit' as described above - every single time after a reset and testing out in 3dmark.
I stumbled upon this fix:
Note, this is for a MSI motherboard, but still for a B650 and AM5 chipset.
I have a wireless network card installed in my pc, where I connected the card to one of the USB pins on my MB, to access the BT of the card. When I unplugged this cable, all of the sudden no 'short circuit' problem when I ran the 3dmark demo.
I repeated this a few times and the demo ran without any problems. Next I ran some video compiling with Davinci Resolve to see if the CPU would trigger anything, but now problems occurred.
So, yeah, not sure exactly what the problem here is. In the MSI thread, 'motherboard tension/flexing' is suspected, in other thread it was just bad quality control from ASUS/MSI (people claim they got board sweepouts and problem was not there anymore etc).
I am going to test it further this week, otherwise I might contact Wootware for either a swap-out, or switch to another manufacture and pay in the difference.