02-04-2017, 08:29 PM
I typically do not recommend using UPS for cracking rigs. For one, as radix identified, UPS won't do a whole lot for a cracking rig under load. Most likely won't even keep it on long enough to gracefully shut down, unless you have a serious fucking UPS. Two, password cracking ops likely aren't mission critical and a little bit of downtime is usually acceptable. I don't know of anyone who has a 5-9s requirement for password cracking ops. Three, there is sufficient fault tolerance built into Hashcat (and for my clients, Hashstack as well) that you can easily resume operations when power is restored. So yeah, I wouldn't worry too much about UPS. Direct power is best for most all use cases.