MemTest86 vs Windows Memory Diagnostic: MemTest86 is the only reliable test for RAM stability

MemTest86 tests every address with specific patterns that expose marginal hardware errors, while Windows’ built-in tool can miss intermittent failures under heavy load. Boot MemTest86 from a USB and let it run at least one full pass (2–3 hours for 32GB). A few hours of testing now saves days of random crashes later.