Suitable UPS for desktop

Hydragyrum · Mar 20, 2018

I am planning to buy an APC Back-UPS BX800LI-MS unit for my desktop.

Here are the specs:
cpu = core2duo e7400
ram = 2 x 2gb ddr2 800Mhz
mobo = gigabyte g41m combo
hdd = 1 TB seagate barracuda
psu = Seasonic 620w M12ii evo
gpu = palit gtx 750ti stormx dual 2gb ddr5
mon = 17" LG flatron
case fans = 2 x 80mm
hsf = deepcool iceblade

Now, I know that my system has little power draw, but I would like to know if the UPS that I'm planning to buy will still be viable should I build a new set consisting of these items:

INTEL build
cpu = intel i7 8700k
ram = gskill trident Z 2 x 8gb ddr4 3200 mhz
mobo = MSI Z370 PC Pro
hdd = 1 tb seagate barracuda
ssd = samsung 850 evo 256gb
gpu = palit jetstream gtx 1060 6gb
mon = LG 23MP68VQ
hsf = Noctua NH-U12S
case fans = 3 x 120mm
odd = asus dvd-rw 24x

-OR-

AMD build
cpu = amd ryzen 7 1700x
ram = gskill trident Z 2 x 8gb ddr4 3200 mhz
mobo = MSI B350m Mortar
hdd = 1 tb seagate barracuda
ssd = samsung 850 evo 256gb
gpu = palit jetstream gtx 1060 6gb
mon = LG 23MP68VQ
hsf = Noctua NH-U12S
case fans = 3 x 120mm
odd= asus dvd-rw 24x

Keyboard and mouse are both non-gaming versions.

Say, I will not be overclocking my theoretical system, can the said UPS still suffice? If I would be overclocking, what UPS should I buy?

PS: I will be using the system for gaming, and usage would be 10-16 hours everyday.

t53186 · Mar 20, 2018

Do you know how long you would want the ups to supply power during a utility outage?
Here are links to three selection tools that may be of assistance when determining the size of a ups.

APC http://www.apc.com/tools/ups_selector/pso/zones/
CyberPower https://www.cyberpowersystems.com/tools/
DELL http://www.dellups.com/ups-selector

Hydragyrum · Mar 20, 2018

At least 10-15 minutes so that I can save files and properly turn off the pc.

Hydragyrum · Mar 20, 2018

At least 10-15 minutes so that I can save files and properly turn off the pc.

guanyu210379 · Mar 20, 2018

1. Power rating
Choosing UPS, you need to roughly calculate your average PC power usage.
For 1700x 6gb+1060 or 8700k+1060 6gb, you can take anything starting from 600VA.
Going with higher capacity will not hurt your PC but your pocket, so, choose the ballance.
Choosing to tight is also not good, you will need to buy new UPS e.g. after only a new GPU.

2. Pure Sinewave output (different brands have different name for this)
It is best to choose UPS with pure/true sinewave output to avoid issues with your PSU, which could have PFC correction, etc.

3. UPS back-up time (10mins, 15mins, 2 hours, etc.)
If you need more time (or you plan to have more time in the future), it is best to choose UPS with compatibility to use exertnal battery extension. If you are only expecting the standard time under 20mins, this is not necessary.

guanyu210379 · Mar 20, 2018

Now, about BX800LI-MS
From capacity point of view and other basic stuffs, this UPS should be good.
The potential issue could emerge due to "Stepped approximation to a sinewave". Some PSUs accept only pure/true sinewave output.
Among those PSUs is S12II-520. I saw this one having problems with such UPS several years ago.

Hydragyrum · Mar 23, 2018

Thanks t53186 and guanyu210379! But I decided not to buy a UPS for now.

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