[all2]

VW makes an excellent 2.0L TDI that would be a good fit. It would take up about half a rack. You could integrate a fuel cell (say 5 gallons) so that it can function when it is detached from the fuel delivery fans.

If you don't want to worry about piping diesel around your server farm, we could go with compressed air and use air turbines with generators on them. Clean and efficient energy transmission without wires!

[gpderetta]

Does it automatically detects when you are running a benchmark and switches to a special benchmark mode?

[TheTxT]

That’s what the gearbox is for! It will automatically kick into high gear