I think it&#x27;s a matter of price.  GPS receivers are cheap and widely supported by timekeeping software.  The cheapest atomic clock I can find is $1,500, but it&#x27;s a hard thing to search for since the term is used to refer to radio-synchronized clocks.<p>If you did have an atomic clock in every datacenter, you&#x27;d still need to make sure that they didn&#x27;t develop a problem that caused them to drift apart, and also you&#x27;d need to make sure that they were in sync with each other in the first place.