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Ok, 2 web servers, 2 db servers back in 2013, one of the most visited sites out there. https://nickcraver.com/blog/2013/11/22/what-it-takes-to-run-stack-overfl

• NicoJuicy 7y ago
  1 - you said it as was it was current, it is not. 2 - still, in 2013 is not 1 server. It's also more than you said now ( add a tag engine server, elastic search, redis, load balancer) and an insane amount of memory on a lot of those servers. Even then, the stack exchange network is more than that. Saying 1 server, as you did, is not correct and it never was :)