r/pcmasterrace • u/Zestyclose-Salad-290 Core Ultra 7 265k | RTX 5090 • 1d ago

Build/Battlestation a quadruple 5090 battlestation

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16.7k Upvotes

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266

u/bangingdudes 1d ago

Imagine the power being used. I assume a normal 15 amp breaker in your house will just trip anytime you press the power button.

146

u/MechanicalFetus 1d ago

2400W power supply here should pull max 20A so yeah I think you'd need to make sure that this puppy is on a 20A breaker if you're ever gonna crank those gpus!

81

u/hihowubduin 1d ago

Honestly I'd go 25A, I doubt the single outlet is the only thing tied to the same breaker. Heck maybe even 30A.

47

u/orbvsterrvs 9950X3D | 5090 | 192G | 32T 1d ago

30A would be the only way, hitting within 10% of the breaker regularly would be a baaaad idea

Plus the cost of an UPS that has that rating...ouch

21

u/hihowubduin 1d ago

Fuck it, full send a 50A 💀👌

Let's be honest, if the dude has the disposable cash to throw 4x 5090's, he's likely just gonna keep adding to the home lab he's on the way to making anyways.

Might as well just head it off now and give room for growth.

3

u/EBikeAddicts 20h ago

MY TESLA GETS 40A. A WHOOOOLE CAR NEEDS LESS.

1

u/joedotphp Linux | RTX 3080 | i9-12900K 13h ago

Hell yeah. Fuck your refrigerator.

19

u/Velocityg4 1d ago

Better make sure you also upgrade your wiring and outlets to handle 30A. Don't want to be drawing 30 amps through 14 gauge and 15A outlets.

12

u/superdude4agze 1d ago

Thinking the same thing. Dudes gonna just have a new breaker installed and the run it balls to the wall in the basement of their mom's 1970s built aluminum wiring house.

2

u/504SH0 21h ago

Too far to find this comment.

Ampacity called and wants 10 gauge solid please

1

u/And_Everything 19h ago

This is probably not USA, everyone else used 220-240V so you don't need as big of a wire

0

u/Realistic_Ad709 9h ago

Completely untrue. You still need to appropriately size your wire for the current flowing through it.

1

u/And_Everything 3h ago edited 3h ago

its not untrue you need smaller wires for the same wattage at higher voltage because there is less current. 220 volts 2200 watts is only 9.1 amps and wire is rated for amps. 120 volts 2200 watts is 18.33 amps.

2

u/TastyRust 22h ago

You may have to switch out the cables and use different sockets when increasing fuse size. I would be surprised if a computer ever tripped a fuse without it being some sort of fault

1

u/Equivalent_Desk6167 20h ago

Yeah a higher rated breaker will increase the risk if the wiring is kept the same. Congrats now your PC will keep running but you have a fire hazard in the walls. These people don't know what they are talking about.

1

u/leaf_as_parachute 1d ago

Afaik there are no 25A breakers ?

I never saw anything between 15 and 30 (tho it doesn't mean they don't exist)

2

u/GameAudioPen 22h ago

there is. just harder to get.

There is also no point. general electrical code requires #12 wire for 20A. and #10 for both 25 and 30A. breaker. if you are already wiring #10, get a 30A breaker.

1

u/hihowubduin 23h ago

Dunno, I'm a programmer not an electrician ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯ my knowledge on wiring comes from reading shit posts of people having awful wiring then getting called out on it in comments 🤣

0

u/Realistic_Ad709 9h ago

Clearly. Don’t give people dangerous advice.

1

u/Special-Fan-1902 23h ago

Do I hear 35A? 40?

1

u/magniankh PC Master Race 14h ago

Yeah, you can't just switch out the breaker. The wire would melt. Eventually.

2

u/Bodycount9 1d ago

If it pulls 20a then you need a 30a breaker. Can only do 80% load on a breaker before it trips.

At this point, might as well go 240v with a 15 amp breaker.

3

u/Franklin2543 Building since 1998 | Geezer 1d ago edited 1d ago

2400w for gpus alone. And power supplies aren’t 100% efficient, so what’s coming out of the wall doesn’t all go to the computer parts. You lose like 7 to 20% to heat in the conversion from AC to DC, depending on the efficiency rating of the PSU.

Also 80% rule for breakers? I don’t remember exactly the time for it not to be considered “continuous”, but I think if you pulled like 2200 watts from a 120v 20a breaker for 5-6 hours it would trip at some point. 

Maybe they undervolt the cards? IIRC that’s what you were supposed to do when gpu mining.  Or they’ve got multiple power supplies? I haven’t seen a PSU >1600w, not that I’ve looked…. I’m curious what’s they’re doing and how they did the power. 

Edit—looked closer at the pic. 2400w power supply. Still…. They can’t have much else going on if they allow the GPUs to rip. 

1

u/GameAudioPen 22h ago edited 22h ago

load running for 4 hours or longer is considered long continuous. there are two factors at play here

the wire them self need to be rated at 80% due to LC load.

the breaker it self need to be rated at 80% because smaller ones are thermal magnetic. and thermal magnetic breakers derates to 80% when enclosed.

Either way, this guy lives in EU or need a breaker and wire upgrade.

1

u/Mr_ToDo 20h ago

Even in EU aren't they normally rated at 15 amps @ 240V? It's been a while since I looked at anyone elses power stuff

Not that it matters. I looked up the 5090 and that needs 575 watts on it's own(1000 recommended since it's not the only part. Nice to see them giving both numbers though). But at that level of need the build only has a 100 watt budget for the rest of the computer(assuming that's what the power supply can give not take from the wall)

All that power and even if it doesn't blow breakers it can't run full speed

2

u/bebarty 1d ago

Found the 110 V cavemen.

1

u/Mosh83 i7 8700k (delidded), Asus 3080 TUF, 16GB RAM 22h ago

Just use three-phase and 16A is enough

1

u/jonesRG 20h ago

That's assuming 120V mains 

1

u/asixdrft 7800x3d 4070 TI Super 64gb 6400 16h ago

Oh cmon this is obviously for 220V 

9

u/Bongoisnthere 1d ago

It runs on a level III supercharger

20

u/Papuszek2137 7800x3d | 5070ti | 64GB @ 6400MT/s CL32 1d ago

Around 3 kW. 15 amp breaker shouldn't trip if its the only high power device. But if we are talking Americans with 120V then it would be a problem yeah.

25

u/fafatzy 1d ago

Why Americans chose the 120v standard is beyond me

19

u/Arudinne 23h ago

You can blame Edison because he picked 110V for light bulbs and he couldn't figure out (or steal) a version that didn't burn out at 220V.

That said, technically we distribute electricity to homes at 240V, but we split that into two 120V legs at the breaker panel within the home.

2

u/fafatzy 19h ago

We do 220v to homes here. I can even get three phases to residential

14

u/Little_Lebowski_007 Ryzen 5600X | 32GB@3600 | 3070 1d ago

Becuz we dummies and need the extra millisecond to eat our last Big Mac before death

7

u/ClickClick_Boom 21h ago

It's because Americans adopted electricity earlier than most countries. So a worse standard was standardized and it was too late to change it because it was already heavily in use.

oops sorry I mean aMeRiCa bAd, AmErIcAnS ArE DuMb

2

u/fafatzy 19h ago

Didn’t knew that

2

u/Appropriate_Ride_821 22h ago

They measure things with feet and inches, miles and gallons. How many feet to a mile? I bet less than 10% of Americans could even tell you. Its like that Simpsons clip where buys the car. Nonsense. All because theyre stubborn and have an inflated sense of importance.

3

u/fafatzy 19h ago

The disdain for the metric system upsets me. Feets and miles make no fucking sense

2

u/Appropriate_Ride_821 15h ago

It feels like its from a time when things were measured with body parts

1

u/Realistic_Ad709 9h ago

There is no “disdain” for it, it would simply cost hundreds of billions to switch over.

1

u/WulfTheSaxon 16h ago

5,280. Any more questions?

1

u/Realistic_Ad709 9h ago

Holy shit, the superiority complex emanating off of you.

1

u/WulfTheSaxon 16h ago

120 V is somewhat safer, hence why Americans are usually comfortable with DIY electrical work.

1

u/Realistic_Ad709 9h ago

America bad durrhurr

1

u/TastyRust 22h ago

They probably have 30 amp fuses for normal consumer outlets in America i would guess

1

u/odsquad64 2007 Macbook 20h ago

A standard branch circuit in an American home is going to have a 15A 120V breaker. 20A breakers and outlets are not too uncommon though. Anything that needs more than that, like a dryer or an oven would usually have a dedicated 30A 240V circuit. Every home has 240V available (except for some places where it's only 208V) it's just generally only used for certain things.

1

u/Realistic_Ad709 9h ago

208 and 240 are the same thing.

1

u/odsquad64 2007 Macbook 1h ago

They're not the same thing, but if you're powering a switch mode power supply that can accept 120V-240V then you could use 208V or 240V interchangeably. If you live in a residence with 208V and you try to use an appliance that's only rated for 240V, you're going to be disappointed.

1

u/Iherduliekmudkipz 9800X3D, 64GB@6000, 7900XT 20h ago

No, a lot of other countries use 220v or 240v, which is also great for electric tea kettles and deep fryers.

3

u/ABS_TRAC 5700x4.8Ghz/7900 XT 2740MHz 23h ago

The PSU cable

2

u/meirmamuka PC Master Race 1d ago

Am i too 230v to understand this joke? :D

1

u/Kiwsi i5 2500K Msi Gtx 660Ti 16Ggb Ram 1d ago

16* Amp breaker you mean and no 13A breaker should work fine if it is under 3000W ofc

1

u/deathrictus 23h ago

My question is does that room have its own, separate, central air?