Triple PSU - One Case

[LateGamingTwitch]

Can the Corsair 1000D case support one SFX PSU behind the main motherboard which will power the motherboard, one ATX PSU that’s synced with the back SFX PSU that’s powers a RTX 4090, and replace the HDD bay with a SFX PSU that powers a Mini-ITX motherboard?

[Guest]

Thats gonna be a big challange figuring out how to mount those things

[johnt]

Um why? I don't understand what you're trying to do. You want to put three PSUs in one huge case? Clearly you can, one of the PSU's might not be firmly secured to the case and you may need to use double sided tape to hold it in place. But the screws play another role which is grounding the case, so you should pick up a short (8 to 12 inch) copper cable to connect to a dummy screw port on the unsecured PSU and connect it to the case. This will help with grounding. You might be able to 3D print something, but the plastic won't transfer the ground, you still need a short copper cable.

 

I don't see the benefit of multiple PSUs for the same computer. Contrary to the reddit and twitter crowds, you do not need a dedicated 20 amp circuit to run a 4090 with a 2400w PSU. A 1000 to 1200w PSU will do just fine.

[Cavalry Canuck]

9 hours ago, johnt said:

Um why? I don't understand what you're trying to do. You want to put three PSUs in one huge case? Clearly you can, one of the PSU's might not be firmly secured to the case and you may need to use double sided tape to hold it in place. But the screws play another role which is grounding the case, so you should pick up a short (8 to 12 inch) copper cable to connect to a dummy screw port on the unsecured PSU and connect it to the case. This will help with grounding. You might be able to 3D print something, but the plastic won't transfer the ground, you still need a short copper cable.

 

I don't see the benefit of multiple PSUs for the same computer. Contrary to the reddit and twitter crowds, you do not need a dedicated 20 amp circuit to run a 4090 with a 2400w PSU. A 1000 to 1200w PSU will do just fine.

He did mention a second system. But even then, a single 1500-1600 watt PSU could power both, or one PSU for each system, sized appropriately.

 

That said, I will join the chorus asking the OP: Why do you want to do it this way?

[LateGamingTwitch]

13 hours ago, Cavalry Canuck said:

He did mention a second system. But even then, a single 1500-1600 watt PSU could power both, or one PSU for each system, sized appropriately.

 

That said, I will join the chorus asking the OP: Why do you want to do it this way?

It’s for “future proofing” because each two years when another RTX Flagship GPU comes out it would increase the power by a factor 150W or 200W per 2 years, so by 2028, 600W could be 1200W running with two 12VHPWR. That is of course if the upcoming ATX 3.0 PCIE 5.0 PSU could include two 12VHPWR.

[Cavalry Canuck]

6 hours ago, LateGamingTwitch said:

It’s for “future proofing” because each two years when another RTX Flagship GPU comes out it would increase the power by a factor 150W or 200W per 2 years, so by 2028, 600W could be 1200W running with two 12VHPWR. That is of course if the upcoming ATX 3.0 PCIE 5.0 PSU could include two 12VHPWR.

That’s a big assumption. However, I’ll play your game.
 

Assuming your assumption is correct, if you can afford a new NVidea flagship card every two years, you’ll be able to afford a new power supply to support those wattages.

Something else to consider is that the communication between PCIe devices and PSUs with ATX 3.0 may require that each device be powered by a singular PSU. Having one device powered by and communicating with two devices may cause issues. Your hypothetical 7090 Ti could be asking for 1200 watts, so each PSU makes 1200 watts available, and subsequently suffers errors that cause it to shut down because it’s only giving 600 watts of the 1200 demanded.
 

Even if you don’t want to go that route, what you want is achievable with two power supplies, no need to be trying to mount a 3rd SFX power supply somewhere.

 

And how are you going to power your machine off a single circuit? The number of PSUs you have won’t matter if the circuit won’t support the combined power draw. Having one device draw off multiple circuits is an electrical hazard.

[fonzz1e]

time to look into enterprise server psu (aka loud AF psu on full load on 240v)

[Ralf]

Will you use the worlds strongest ATX PSU?

[Jeppes]

On 10/3/2022 at 6:05 AM, LateGamingTwitch said:

It’s for “future proofing” because each two years when another RTX Flagship GPU comes out it would increase the power by a factor 150W or 200W per 2 years, so by 2028, 600W could be 1200W running with two 12VHPWR. That is of course if the upcoming ATX 3.0 PCIE 5.0 PSU could include two 12VHPWR.

Worry about it if you get a 1200W gpu. Highly unlikely to happen.