High end system, please suggest a suitable APC UPS

[rickey_apc]

Greetings

I'm building a new system

and I'd like to use a proper APC UPS with it.

Specs:

CPU: Intel i7 4790k

VGA: GTX 780 Ti  (MSI GTX 780Ti GAMING 3G)

HD: 1 high rpm sata3

SSD: 1 SSD M.2

PSU: 1000W 80+ Platinum (EVGA SuperNOVA 1000 P2)

Monitor LCD 24"

Modem/Router

I already have an old APC Back-UPS RS 800,

but,  I think that it's not proper for my new system,

plus that it's previous battery had died, and I would need to buy another one, in order to use it.

Please suggest me a suitable APC UPS.

[rickey_apc]

Greetings

I'm building a new system

and I'd like to use a proper APC UPS with it.

Specs:

CPU: Intel i7 4790k

VGA: GTX 780 Ti  (MSI GTX 780Ti GAMING 3G)

HD: 1 high rpm sata3

SSD: 1 SSD M.2

PSU: 1000W 80+ Platinum (EVGA SuperNOVA 1000 P2)

Monitor LCD 24"

Modem/Router

I already have an old APC Back-UPS RS 800,

but,  I think that it's not proper for my new system,

plus that it's previous battery had died, and I would need to buy another one, in order to use it.

Please suggest me a suitable APC UPS.

[BillP]

Hi,

I recommend our Smart-UPS SMT2200i If your power supply can draw 1000W you would want a UPS that can handle a large load. You could utilize a smaller SMT if you know that the power supply will never be drawing its full capacity. The next smaller SMT model is the SMT1000i and its maximum load is 1000W

Note: with the SMT2200i you will need 20 amp input.

[rickey_apc]

Thanks for trying to help, but I think that both your suggestions are not appropriate for my system (the first is too much, the latter too small)

About the Smart-UPS SMT2200i:

based on it's specs page https://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SMT2200I

it says that it has Output Power Capacity: 1980 Watts

which is double my PSU's maximum output .

Also, the next smaller SMT model, which you suggest, SMT1000i,

in it's specs page https://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SMT1000I

it says that it has Output Power Capacity 700 Watts,

which doesn't match the "maximum load is 1000W" that you wrote.

I thing that a proper UPS should be of 1300 VA,

which based on the rule of thumb W = 0.6 * VA   the wattage rating of a UPS is approximately 0.6 * its VA rating)

should give 780W, that, it's around my system's power consumption, as I estimate it.

Am I wrong?

[smargh_apc]

• It's best practice to keep a UPS at 50% max load.
• PSU input power is higher than output power.
• Which UPS is appropriate for you depends on your anticipated highest PSU input power requirements.

Personally I think a SURT1000XL(I) or SURT2000XL(I) would be nice if you have the money or can find one 2nd hand, or perhaps especially if you have dirty regional power, but it does depend on your expected maximum loaded power requirements.

I also don't think you need a 1000W PSU for that kit, unless you'll be adding more graphics cards or adding extra kit in the future. PSU efficiency is slighly lower at less load.

[BillP]

Not sure if you've considered seeing what the APC UPS Selector spits out yet?

UPS Selector - Select your protection needs

[roger_apc]

What the "name plate" rating of the power supply say, and what the actual power requirements are, can (and usually are) vastly different.  We have multiple(8+) servers (HP Proliant 380 G8 and Dell Power Edge 2950) each with a PS rating of 500 watts or more each running on metered PDU's.  In fact, each one draws about 100 watts of power.

Imagine (10) 100 watt light bulbs sitting on or under your desk.  That would be a lot of heat!  Now put your hand close to wherever the air is being exhausted from your system.  Does that even feel close?  All of the energy (with reasonable measurement methods) that is put into a computer system is translated into heat.  Think about the fact that a really good electric heater (plug in type) will only be rated at 1800 watts (in North America).  Is your computer putting out anywhere close to that much heat?

I would bet that the actual load of your computer system will be (well) under 200 watts.  If you are in Southern California, I'd bet a steak dinner (you choose the place) on that.

Proceed as you see fit.  🙂

[rickey_apc]

Yes, I've tried the APC UPS Selector and it gives 261W, and that's without the VGA.

For the VGA, In it's specs page it says that it's power consumption is 250W.

Therefore we go to 261W+250W=511W (plus the consumption of a modem/router).

That's what the UPS Selector suggests for Load Requirements of 550W:

Best Price: SMC1000I

Best Value: SMT1000I

Best Performance: BR1500GI

Therefore, will I'll be ok with a UPS of 1000VA ? (most probably SMC1000I because I don't think I can afford any bigger one)

[BillP · Accepted solution]

One of the items to consider is how fast the UPS will cut in when there is a power event. I had built a system a couple of years back with an Antec power supply and found that the UPS couldn't cut in fast enough to prevent the system from bouncing. I ended up purchasing a double-conversion 1500VA UPS. That type of UPS is more expensive, but it provides better protection.