[jwiz]

How do you even get that many computers without ECC? I think all the blades I've seen have ECC as baseline spec.

[undersuit]

Google started with "standard PCs", though I'm not finding any info if they used ECC memory.

https://blog.codinghorror.com/building-a-computer-the-google...

https://patents.google.com/patent/US6549988

[latchkey]

They were purpose built and didn't require 100% uptime.