This will probably get buried in the ongoing "Classic is shit, actually" debate, but apologies for not being around these past couple of nights/mornings.
Spent much of yesterday trying to get my supposed "Dream Rig" working again (as seen here: >>1844444), to largely disappointing results.

Second 9800X3D is installed (first one was RMA'd), and it seems to be functioning as intended. Marks and temperatures during Cinebench24 looked just fine.
RAM slots on this motherboard have suddenly become a very big issue, however. Bought two new compatible DDR5 sticks (same ones as I used before in this setup), both of which are individually confirmed to work in testing. Yet nearly all arrangements of RAM result in the machine failing to survive POST.
Only installing a single stick into A2 (and /only/ A2) can get past POST and boot into BIOS or my OS. BIOS is on the latest version, its settings are defaults, and the CMOS has previously been cleared.

Additionally, trying to launch any vidya in this state has become incredibly inconsistent.
TERA Classic just crashes upon selecting the server, guaranteed. Guild Wars 2 only /sometimes/ loads, with most attempts hanging when rendering character select (yet sometimes it works just fine with all settings maxed, proving it's not a GPU-related issue). Etc.

At this point, I've come to the conclusion that there's no point in trying to work with this shoddy ASRock Taichi X870E motherboard any further, and am looking into just replacing it outright with something far more reliable.

If (You) have any suggestions for a respectable X870E motherboard, or even a solid B850 one which won't die-out on me in the short time it's taken this crappy ASRock Taichi to do the same, please let me know.
I'm so sick of having this incredible tower I saved up for years to build lie dormant on my workbench, virtually unusable now, despite it functioning perfectly fine just two weeks ago.