Hello, The rule-of-thumb conversion factor for converting VA to Watts = .6 (For example, I have a APC UPS, and it says on the box 500 VA/300 Watts). Some UPS companies today use a higher conversion factor like .7, but .6 is more accurate. So, 1500 VA x.6 = 900 Watts. If your system requires 7.5 Amps/900 Watts, you will need a UPS larger than 1500 VA. If it requires 9 Amps/1140 Watts, you will need a much larger UPS. Bruce =========== Neil wrote: > OK, everymac.com didn't have the power supply specs for my Mac, so I > downloaded a PowerMac user guide from the internet. It says 7.5amps or > 9.5amps. I think the 9.5 is for the original G5/2x2. Mine is the 2004 > revision. I think it uses the more efficient G5 CPU, so I'm guessing the > power supply is only 7.5amps. That still sounds like a lot though. At > 120volts, that would still be 900watts. So, I can put my display and > external drives on my Belkin 720VA, and get a bigger UPS for my PowerMac. > Here are a couple I'm looking at. Any suggestions? Thanks. > > APC > <http://www.buy.com/prod/APC_BR_1500_Power_Supply_BACK_UPS_RS_1500VA_BR1500/ > q/loc/227/10346095.html> > > Tripp Lite > <http://www.buy.com/prod/Tripp_Lite_SmartPro_1500_VA_Rackmount_Tower_Digital > _UPS_1500VA_900W_3/q/loc/227/202149107.html>