UPS as in uninterruptible power supply, not the delivery company. I have a 600W UPS that I plugged my Mac Pro into, knowing it was probably a little undersized. I have the 16-core version. When running benchmark tests that pegged the CPU's, the UPS alarms went off showing an overload on the power draw. Checking Apple's site, they don't list all processors, but they do list the entry and high end:
A large 1000W or greater UPS isn't cheap, although prices can range a good bit. I got a 1500W one for the Mac Pro and I'll use the 600W for the ProDisplay and peripherals. I have flaky power at my office; it often will sag and/or flicker on or off. Rather than risk any damage to a pretty pricey computer, a good UPS is a minor investment.
Mac Pro power consumption and thermal output (BTU/h) information - Apple Support
Learn about the power consumption and thermal output of Mac Pro computers.
support.apple.com
A large 1000W or greater UPS isn't cheap, although prices can range a good bit. I got a 1500W one for the Mac Pro and I'll use the 600W for the ProDisplay and peripherals. I have flaky power at my office; it often will sag and/or flicker on or off. Rather than risk any damage to a pretty pricey computer, a good UPS is a minor investment.