this post was submitted on 05 Feb 2025
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I'm in the process of getting my Home Assistant environment up and running, and decided to run a test: it turns out that my gaming PC (custom 5800X3D/7900XTX build) uses more power just sitting idle, than both of my storage freezers combined.

Background: In addition to some other things, I bought two "Eightree" brand Zigbee-compatible plugs to see how they fare. One is monitoring the power usage of both freezers on a power strip (don't worry, it's a heavy duty strip meant for this), and the other is measuring the usage of my entire desktop setup (including monitors and the HA server itself, a Lenovo M710q).

After monitoring these for a couple days, I decided that I will shut off my PC unless I'm actively using it. It's not a server, but it does have WOL capability, so if I absolutely need to get into it remotely, it won't be an issue.

Pretty fascinating stuff, and now my wife is completely on board as well; she wants to put a plug on her iMac to see what it draws, as she uses it to hold her cross-stitch files and other things.

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[–] [email protected] 59 points 2 weeks ago (3 children)

What kind of freezers are they? I hear that top loading freezers are quite efficient because the cool doesn't escape when it gets opened like a front loading one.

[–] [email protected] 34 points 2 weeks ago

That's true; once everything inside is brought down to temp, they use very little power to stay cold.

My regular fridge uses ~500-800wh a day (depending on how much it got opened). My chest freezer though, uses ~200wh/day pretty consistently.

[–] [email protected] 15 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

One is a smaller chest freezer, about 3 feet tall, probably 6 or 7 cubic feet if I had to guess. The other is a Hamilton Beach upright freezer from Costco. Both are full, so that helps with keeping them cold.

[–] [email protected] 10 points 2 weeks ago (1 children)

Both are full so it reduces the amount of cold air that can escape when you open them.

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[–] [email protected] 4 points 2 weeks ago (2 children)

And why the old "ice boxes" are top load only. And why most boat fridges/freezers are top-load, because energy is scares/finite when disconnected from power.

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[–] [email protected] 37 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

Have you considered putting your gaming pc in one of the storage freezers? /s

[–] [email protected] 25 points 2 weeks ago* (last edited 2 weeks ago) (2 children)

Perfect, I don't need to run the fans anymore!

Seriously though - we have 5 kids, and feeding the little shits is expensive, so we freeze a lot of things for storage. I thought for certain the freezers would be power hogs compared to an idling PC, but I was very surprised to be proven wrong.

Next up... Measuring my server cluster 😬

[–] [email protected] 37 points 2 weeks ago (12 children)

Measuring my server cluster

Personally, I just don't ask questions I don't want the answer to.

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[–] [email protected] 4 points 2 weeks ago (1 children)

Have you considered putting your children in one of the storage freezers? /s

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[–] [email protected] 30 points 2 weeks ago (16 children)

Yeah, man, getting into Home Assistant and messing with energy monitoring did more than thousands of chastising TV segments to get me to fully shut down my computers.

Who gives a crap about gaming use power consumption, give me idle benchmarks, you cowards. Do you even know how kWh work?

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[–] [email protected] 26 points 2 weeks ago (1 children)

Chest freezers are exceptionally energy efficient. It's not a very good comparison.

[–] [email protected] 6 points 2 weeks ago* (last edited 2 weeks ago)

Ah, but only one is a chest freezer 😉

That, and I used to have a freezer that was a power suck.

[–] [email protected] 18 points 2 weeks ago (4 children)

It has never occured to me my whole life to not suspend or shut down computers overnight. It wakes up in like 2 seconds why wouldnt you, even if it used only an extra 1W

[–] [email protected] 18 points 2 weeks ago (4 children)

You must be pretty young, because back in the dark days of spinning HDDs a computer would take 5+ minutes to boot.

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[–] [email protected] 9 points 2 weeks ago (2 children)

The problem I have with this I put the PC to sleep overnight every night - and like clockwork, Windows wakes it back up sometime overnight to do.. Something.

I've been diagnosing the issue for years - checking wake timers, switching hardware devices permissions to wake the system off. I might fix it for a few months and then a new Windows update comes along and it's back to its usual routine of waking itself.

Looking forward to seeing if it persists with Linux when I move at the end of support period for Win10 later this year.

[–] [email protected] 12 points 2 weeks ago (2 children)

Looking forward to seeing if it persists with Linux

I have never had what you described happen in my past 15 years of using linux, i hope you find your way around things, linux is dope once you get used to it.

My PC goes down from 70W idle to 2W when suspended. I also have a master slave power strip, that turns of all my peripherals (speakers, lights, audio interface, etc) when the PC drops below 10W so that saves some extra energy.

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[–] [email protected] 5 points 2 weeks ago

It has never occured to me my whole life to not suspend

Reliability issues with suspend-to-ram are rather common. Shutting down is an option, but session save and restore is a relatively recent thing and not supported by all desktop environments. I.e. it's the post startup part that takes the longest.

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[–] [email protected] 16 points 2 weeks ago (1 children)

Those storage freezers are doing nothing the vast majority of the time. Not really a fair comparison.

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[–] [email protected] 15 points 2 weeks ago* (last edited 2 weeks ago) (4 children)

I discovered a similar issue. PC desk was using 8-9W when the PC was turned OFF! My power strip was taking a bit under 1W (the little light, old), two smart bulbs as well but I'll allow those losses. An older Logitech speaker setup (2+1) was taking 6-7W, turned off! Crazy.. and illegal if it were made today (in EU). So this is completely wasted energy in my opinion.. started disconnecting the whole desk now.

For comparison, my home server is averaging 7-8W, turned on all the time:

I also learned that PC's draw a lot of power lol. I used to sit on my PC all day, now I know how much it cost. Even the monitor turning off splits the power draw by half.

[–] [email protected] 6 points 2 weeks ago

Older speakers like that use always on transformers, constantly wasting energy to keep the core energized. You're correct those cannot be made any more, they must use efficient switch mode supplies.

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[–] [email protected] 12 points 2 weeks ago* (last edited 2 weeks ago) (5 children)

Yeah, energy monitoring ruined several things for me. Can't let my PC idle anymore, can only turn on the dishwasher when the sun is shining, need to explain regularly to my wife, why our home network and server infrastructure consume 130 Watts per hour, have to automate all plugs with standby devices connected...

The damn freezer consumes only 400 Watts per day while Network infrastructure, server, Wallpanels and KNX consume 3 Kilowatts, I wish I would have never learned this.

[–] [email protected] 5 points 2 weeks ago (1 children)

There is a reason people opt for old desktop CPUs and SSD's

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[–] [email protected] 4 points 2 weeks ago (2 children)

Just fyi, Watts is a measure of power, and WattHours is power over time. So your home network and server consume 130w, which would be 130wh after an hour, or 3120wh after a day. The chest freezer would be 400wh in a day, rather than 400w in a day.

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[–] [email protected] 12 points 2 weeks ago (4 children)

Couple of thoughts:

  1. That smart plug may not be rated to the max wattage when GPU and CPU are at full blast. Be careful, because that could be an expensive mistake. Place a surge protector between the smart plug and the PC to be safe. Also run the PC full tilt for a while and make sure the smart plug doesnt get warm. If it does, fores have been known to start from those.

  2. Sounds like you know this with WoL, but suspend is your friend 😉 If the gaming PC is linux and you run into suspend issues, let me know, I've seen 'em all.

[–] [email protected] 12 points 2 weeks ago (3 children)

The plugs are rated for 1800W each. Should be fine. I hit 670W a bit earlier, running Furmark VK and Cinebench R23 multi-core simultaneously for shits and giggles.

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[–] [email protected] 7 points 2 weeks ago (3 children)

Place a surge protector between the smart plug and the PC to be safe.

What benefit does this serve in this situation?

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[–] [email protected] 5 points 2 weeks ago (13 children)

how do you deal with kb+trackpad not working after wake?

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[–] [email protected] 9 points 2 weeks ago (5 children)

monitors

Don't underestimate the power draw of multiple monitors.

But while you're at it: simply turn off different devices on the same power strip and check what actually draws how much.

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[–] [email protected] 8 points 2 weeks ago (5 children)

If you want to expand from just monitoring a couple sockets to monitoring the whole house; I'd recommend Iotawatt. I've been using one of these to monitor every circuit in my house for a few years now.

You can use the built in webpages shown below to view it's internal graphs, or setup an exporter to feed the data into external DBs like influxDB+Graphana or Emoncms.

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[–] [email protected] 8 points 2 weeks ago

If it gets the wife approval you know you are on to something

[–] [email protected] 6 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

Cool!

Just be cautious that you don't over-optimize for power. I ran around my house w/ a Kill-a-watt meter checking everything and made some tweaks, and I still don't think it has paid for itself since power costs are so low here ($0.12-0.13/kWh, so 10Wh 24/7 < $1/month), and some of the things I tried doing made my life kinda suck. So I backed off a bit and found a good middleground where I got 80% of the benefit w/o any real compromises.

For example, here's what I ended up with:

  • put desktop to sleep - power draw is negligible, and I don't need to keep typing my FDE password to use it
  • "upgraded" NAS from old 2009 HW to my old gaming PC HW (1st gen Ryzen) - cut power draw in half, but I had to buy some RAM; will take years to pay off w/ electricity savings, but it has much better performance in the meantime
  • turn off work laptop - was drawing ~20W; I WFH MThF, so I leave it on Th night for convenience, but have it sleep M-W and turn it off Friday

I could probably cut a bit more if I really try, but that would be annoying.

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[–] [email protected] 5 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

My desktop PC idles quite high as well. The semi high-end consumer motherboards on the AMD side tend to use a lot of power at idle, so I think that's a big part of it (at least the x570 series, can't speak for later). And as others have said, high refresh rate and multiple monitors can make things worse.

I'll add though that people's perception of how much power there system is using can be skewed by software based monitoring tools. People may think there system is using only 50W because that's what software reports but it's actually drawing a 100W at the wall.

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[–] [email protected] 5 points 2 weeks ago (7 children)

If I'm reading that correctly, that shows the system is drawing around 100W just sitting idle.

Something is not right there.

Either the power meter is way out of calibration, or there is a configuration issue with your PC. Maybe you have a performance setting that is causing the CPU and GPU to not idle down ever? Or a rogue antivirus software that is cranking the CPU constantly?

Are there any spinning disk hard drives in your PC? They can sometimes use around 5W each on idle. That was the biggest cause of idle power consumption on my old xeon server, with 8 HDDs.

PSU choice can also affect it. Eg, if you buy into marketing and buy a monster 850W PSU, but it's idle all the time and only uses 450W under load, then the PSU is spending the whole time outside it's efficiency curve, and can end up causing more power draw than expected.

[–] [email protected] 6 points 2 weeks ago

That's nothing; my Ryzen 7000 machine uses 150w at idle. Modern high-end desktops draw a lot of power.

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[–] [email protected] 5 points 2 weeks ago (1 children)

What unhealthy eating habit are you indulging in at 21:45?

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[–] [email protected] 5 points 2 weeks ago (5 children)

How is it possible that it draws 100W at idle? What is it even doing?

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[–] [email protected] 5 points 2 weeks ago (3 children)

Does it clock down when idle?

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[–] [email protected] 4 points 2 weeks ago (1 children)

I also found out something interesting. My desktop uses about 1/3 of the power one of my freezers do. :)

[–] [email protected] 7 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

That's either a really efficient PC or a really old freezer 😂

[–] [email protected] 5 points 2 weeks ago

The PC is effecient. It's not a gaming PC. It idles at around 16W and maxes out at 80'ish.

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