RAM corruption is not cheap to protect against

You need parity, which is cheap, or lockstep duplexing, which isn't. Or, you know, sometimes you can just restart malfunctioning processes and repair corrupted filesystems while you run the failed tasks again on another node.

At today's prices perhaps, but pre ChatGPT you just have to run more of it + more error correction. Not great for the power budget but not anything significant in the grand scheme of things.