650watt PSU on ?VA UPS?

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manskou

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Jan 24, 2015
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Hello,

I am currently searching for a UPS for my setup, My pc's psu is a 650watt one, but I want to connect my 22inch monitor and my cheap modem/router. So how many VA or Watts PSU do I need to get? I think APC is my best choice, right?

My PC's Specs:
CPU - AMD FX-6300
GPU - GTX-760
2x 7200rpm HDD's
and No Disc Driver

P.S: I think my monitor + my modem/router are less that 20Watts twogether
Thanks in advance :)
 
Solution
nukemaster
Even with a 650 watt power supply, your system most likely does not use 650 watts.

Best bet would be checking with a watt meter. You can buy these at a hardware store and some governments may even allow them to be borrowed to help reduce power consumption.

Your monitor is efficient, my trusty cfl backlit 24 inch screen sucks down 70 watts on its own and the computer it was connected to took like 40ish at idle(kind of sad, but I quite like that screen.).
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nukemaster

nukemaster

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Nov 23, 2004
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Even with a 650 watt power supply, your system most likely does not use 650 watts.

Best bet would be checking with a watt meter. You can buy these at a hardware store and some governments may even allow them to be borrowed to help reduce power consumption.

Your monitor is efficient, my trusty cfl backlit 24 inch screen sucks down 70 watts on its own and the computer it was connected to took like 40ish at idle(kind of sad, but I quite like that screen.).
 
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Solution
M

manskou

Reputable
Jan 24, 2015
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But is my system using the same watts all the time? I mean If I am rendering something will the wattage stay the same as when I am simply browsing the internet? and something else, 1W=1VA right? so (at most) a 650va PSU is good enough right?
 
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
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74,965
Your systems power consumption changes with load(games take more power than browsing the web).

While VA(Volt x Amp) should be watts, it does not work that way on UPSes.

On APCs site you will see the VA to WATT measurement. so 650VA units are good for about 390watts.

I think this has something to do with power factor.

Now at full load most UPSes will only have a very short time to shut the system down so going a bit overkill never hurts. Also note that more expensive ones tend to have a better wave form(pure sine vs simulated sine).

Also note that a power supply is rated on DC output and they always take more AC(loss) to make this DC. Higher efficiency power supplies take less power to make the same amount of DC thus lower the size of UPS you need.

For reference here is what my SmartUPS 1400 shows for a 24 hour wattage log(converted from % to Watts). It honestly looks a bit high at the low end and low at the high end, but it was been a while since I placed a watt meter on it.
141la35.jpg
 
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