HELP ! if my is power supply 1200 watts should i buy 1200 watts UPS ??

[settlementmen]

hey guys i need a UPS for my Workstation PC it has a 1200 watts power supply, i always use on a full load for 3d rendering in 2k resolution, i have a dual Cpu motherboard. I really need UPS for my PC , and for my professional works , so my question is, if i have 1200 watts power supply should i buy 1200 watts UPS ? or i can by any UPS ?? PLEASE ANSWER thanks !!!

 

[GhislainG]

It should run for at least 75 minutes on a 75 Watt load.

 

[transgenic452]

A CRITICAL item most people don't even know about, is that many UPS units will NOT work with a PSU that provides ACTIVE Power Factor Correction (PFC), yet the same UPS works 100% OK with same or even much higher wattage NON-active Power Factor Correction PSUs.

Unfortunately, the specs provided on many retail sites and even on a manufacturer's product page do NOT indicate whether or not the UPS supports active PFC. Some do...some don't.

Bottom line: make sure the UPS you buy supports the type of PFC your power supply uses.

You may have to dig into the DETAILED specifications and in some cases even have to email or call the manufacturer to find out whether the UPS supports power supplies with Active PFC or only supports power supplies with NON-active PFC.

For example, I have a Corsair 750W PSU that has Active PFC which, at the time of purchase, "Active PFC only" was not spec'd on the UPS retail product page. But, my (never having failed before) 900Watt capable UPS FAILS and shuts down after an AC mains power failure when it tries to continue supplying power to that 750W Active-PFC power supply . This happens even though the running system was consumiing less than 200Watts (confirmed by two different hardware meters from different manufacturers)...yet, that same UPS RELIABLY powers different NON-active PFC PSU's running at about 500Watts (PF~.8) on different systems, or when tested by simply running six 100W incandescent bulbs (600Watts total and incandescent bulbs PF~1).


Added note: In addition, make sure the type of UPS output (sine-wave, simulated sine-wave, square-wave, etc) is compatible with your intended load/system