What was the smartest computer you have built and what was it called

Question: What was the smartest computer you have built and what was it called
- Keywords:
  computer,
  digital,
  equipment,
  technology
Asked by Rubarb to Julian, Heather, Helen, Hugh, Jane on 11 Nov 2014. This question was also asked by Montytibbs.
- Julian Onions answered on 11 Nov 2014:
  
  I haven’t really built a computer, I’ve assembled some from parts – but these days you need very high precision equipment to make chips for computers.
  
  The fastest one I have used is call Piz Daint, and is about as powerful as 6000 PS4’s running together.
- Helen Johnson answered on 14 Nov 2014:
  
  I’ve never built a computer, but as an astronomer I write my own computer code to deal with the really large amounts of data I get.

Question: What was the smartest computer you have built and what was it called