lots and lots of data.

No, but the computers contain a lot of stuff which burns with pretty deadly smoke, also probably the paint. But honestly: a real fire is unbelievable since you'd think there is _nothing_ which could make that amount of fire, yet there must be...
Seen a burning garage in my youth where there was only a car and it burned down 2-3 neighbouring garages as well, all asbestos and concrete.