Should I blame the RAM type for random BSODs on heavy workloads?

Probably not. Random BSODs on heavy workloads are usually a sign of a bad stick, not a missing ECC feature. Run MemTest86 or the Windows Memory Diagnostic overnight — if you get errors, replace the faulty stick. If the RAM passes, the issue is likely elsewhere, like power supply dips, overheating CPU, or a driver problem. Swap the stick before you swap the whole server’s infrastructure.