What size UPS do I need for my Windows 10 desktop computer?

Dell Inspiron 17-7737 intel core i7 4500...
August 29, 2016 at 00:33:38
Specs: Windows 10, Core i7 4740/16gb
I have a desktop computer with a Haswell Core i7 4790 cpu with 16gb ddr3 1600 memory, Adata 120gb SSD, a Western Digital 1tb 7200k hard drive, an Nvidia GT 750ti 2gb video card, a blu-ray optical drive, a 2tb usb 3.0 external hard drive and a 4tb usb 3.0 external hard drive and an 850w power supply and I need to buy an UPS for this system. I should know this by now, but I don't and hence, that's why I am here. I greatly appreciate and respect all replies.


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August 29, 2016 at 00:35:49
sorry it's a Core i7 4790 cpu...not a 4740 cpu.

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August 29, 2016 at 01:15:15
All depends how long this UPS has to last after the main AC has been cut (interrupted)??

Calculating your power consumption it should be around 300W. that is without the display(s).

On below website explanation and suggestion on selecting a UPS. If you have a unstable AC power network, make sure your UPS comes with AVR (auto Voltage Regulator) build in. Also keep in mind to check/replace the batteries after 3-5 years of use.

ex. if you choose a 1000VA capacity UPS you could keep going for 2-3 hours until UPS cuts off.


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August 29, 2016 at 09:05:33
Thanks for your reply. Sorry I didn't include the display in the specs. It is a Viewsonic 27 inch display.

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August 30, 2016 at 16:00:37
Thanks for the help. I can always count on the gurus here. An UPS with 400 watts seems to be just what I need. There is death, taxes and Computing.net! Thanks again....Loretta.

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August 30, 2016 at 21:55:45
Way back I started out with 350Watt to 500Watt models and if you only need it to safely shut down the system and help you over the power fluctuations, then it still may be enough. Today I prefer a 1000VA to 1300VA (about 700Watt to 1000Watt) for my computer and ones also running network stuff (Router, switch, etc.) I prefer a 1500VA model. This way after the computer is shut off, the network and wireless will still have about 2 hours minimum for a laptop or cell phone to get on internet via Wifi.

You have to be a little bit crazy to keep you from going insane.

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