Edit:
Looks like my issue was caused by a faulty CPU. Replaced RAM/Mobo and PSU with known good hardware and it still persisted. Intel agreed to RMA the 11500 I had an issued me with a refund. Purchased a 11700k as a replacement and it's been working fine ever since.
My CPU would only ever crash my system when transcoding, p95/furmark were stable, which led me to the confusion of a software level issue.