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That was my thinking but I wanted to be sure. So I'm not trying to cover for the potential full 650 watts the PSU can use, but just the more humble max required power of 292 watts my invoice says my system uses. Or rather a UPS that can cover at least 20 - 30% higher than that - or a bit more to...

Looked around some more, and according to a page on the CyberPower website: "You will need a UPS with sine wave technology if you want to plug-in the following: Apple iMac Computers Computers and Equipment that are Energy Star® or 80 PLUS® efficient systems using Active PFC power supplies."...

The MAIN thing I want to get clarity on though is the 'pure' sinewave vs 'stepped'/'simulated' sinewave issue. Is it important as far as the CORSAIR 650W TXm SERIES psu is concerned? I've seen it suggested stepped sinewave can damage a system if the PSU is Active PFC, which is said to need pure...

It's definitely the odd one out though, and in other examples I've found where both VA and W are shown, the equation does work.

...and I've just seen something online that might suggest it isn't - it showed a sticker on a device which reads 1600va/900w. But 1500 x .6 is 960 and not 900...

Yeah I've seen it recommended that it should be 20-30% higher. What I want some clarity on is if that means you need to be higher than the maximum capacity of your PSU (in my case 650w) OR just higher than the maximum required power if my set up (in my case, according to to my PC Specialist...

It's not unusual to have power cuts where I live an am considering getting a UPS but the more I read the less I'm sure what the right thing is. I have the CORSAIR 650W TXm SERIES power unit in the PC which is obviously 650w. Should I be purchasing a UPS that is above that, or one that is just...