Morgan Stanley analyst Mark Edelstone says that Google is going to start using AMD rather than Intel microprocessors in its homemade servers. That’s a big story. But how many servers does Google actually have? In his report, Edelstone says that Google has more than 200,000 servers, a number that’s being reported as a fact in newswire stories. Is it a fact? In a 2003 article, three Google engineers said the company had 15,000 servers (actually, they called them “commodity-class PCs”). A story in Fortune in April 2005 said Google is “widely estimated to run 250,000 servers.” I’m curious about what the right number is. Has Google recently disclosed its server count? Can someone point me to the truth? (Bonus question: How many computing clusters is it operating at the moment?) Thanks.