It functions identically in practice—pre-OS, pattern-based exhaustive testing. Apple does not offer a third-party memory tester because Macs have integrated hardware diagnostics.
Shut down your Mac, press and hold the power button until you see "Loading startup options." Press Command + D to launch Apple Diagnostics. memory diagnostic tool
You might see random crashes, the dreaded Blue Screen of Death (BSOD), files that become corrupted for no reason, or your computer spontaneously restarting. Before you reinstall Windows or buy a new SSD, you need to run a memory diagnostic. It functions identically in practice—pre-OS