Power consumption of my PC

arkaray89 · Feb 27, 2014

What can me the maximum power consumption of my PC in WATT ? Please help since I would be buying a Home UPS for my system.

XFX 650 watt Pro series PSU powering these following components,
Asus NVIDIA 2GB 650 Ti Boost Graphics card
Asus Sonar DX 7.1 Sound card
Intel core i5-3570 3rd gen processor
Asus P8H77-V LE motherboard
8 GB Corssair Vengance DDR3 1600 MHz RAM
500 Seagate Sata 3GBps HDD

LG 24" IPS LED monitor

ShadyHamster · Feb 27, 2014

You should get an UPS that has the wattage close to what PSU you have, so on your case 650w.

That system how ever would pull no more then 300w give or take.
Add 60w if you plan on running the monitor on the UPS as well.

Someone Somewhere · Feb 27, 2014

I'd look at ~500VA, including monitor. You're not running anything particularly power-hungry, and the PSU has APFC, so a power factor of ~1.

GhislainG · Feb 27, 2014

Someone Somewhere :

500VA only is 300W and the UPS will shutdown if there's a power outage and the whole system draws more than that from the outlet. I would recommend a slightly more powerful UPS (minimum 600VA) to connect the monitor and the PC.

Someone Somewhere · Feb 27, 2014

Nope, 500VA is 500VA. The relationship between VA and watts is the Power Factor, which for an 80Plus-certified PSU is at least 0.9, and probably ~0.99.

GhislainG · Feb 27, 2014

Someone Somewhere :

500VA is 300W because a UPS is approximately 60% efficient. Check your own UPS and you'll understand what I mean. My rather efficient Smart-UPS 1500VA is 980W; therefore I can connect systems that draw up 900W without issues.

A system that draws 300W from an 85% efficient PSU draws more than that from the outlet; the PSU draws 300/85*100=352 watts. That has to be taken into consideration when sizing a UPS, even for home use.

bkoop · Feb 27, 2014

That is an Active PFC Power Supply, so it needs a pure sine wave UPS. Not the cheaper simulated sine wave UPS.

Someone Somewhere · Feb 28, 2014

I'm running an APFC NAS on a modified sine UPS. No problem. IIRC that was an issue with only very few PSUs. Basically fixed now.

No, VA is the apparent power. W is the actual power. The real power is measured in watts. The difference is power factor.

You do have to take into account the efficency. I accept that. However, power factor is NOT EFFICIENCY. They are very different things. Apparent power is the real power, plus the reactive power, which is the power that goes back from the load to the source due to capacitive or inductive loads. Historically, PSUs have been very capacitive loads with low power factors, and thus needing relatively large inverters for their actual power draw. That's changed over the last few years with the advent of active power factor correction, which reduces the reactive power.

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