About 3 Kva is the smallest Double conversion UPS you can get, it will handle any gaming computer you can think of with some to spare.
Sil, you don't need a power conditioner with a double conversion UPS. The one that runs my sound system puts out exactly 50HZ @ 230VAC with a variation of .01%. Double conversion means it charges the batteries full time and then recreates it's own sinusoidal waveform at exactly the right voltage etc. It took all the pops and clicks from domestic power off my big sub woofer and runs the TV and sound system fully protected from any transients.
Alex, Liz sells Eaton products, check out the website for models that suit and are available in Australia. They build stuff for NASA and their gear is rock solid. Stay well away from cheap Chinese knockoffs. They use simulated sinewave from a square wave system. Tends to be rough and can cause problems with sensitive electronic gear.
Other good manufacturers would be APC and Emerson.
I'll check it out myself later and find some models that fit the bill.
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