ECC RAM is more robust (fewer crashes due to random bit flips), and OOB management means if a server has issues, you can remotely view it as if you were jacked

ECC RAM is more robust (fewer crashes due to random bit flips), and OOB management means if a server has issues, you can remotely view it as if you were jacked in, and force reboot, among other things (like installing an OS remotely).