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What PSU is best for RTX 4080?

The NVIDIA GeForce RTX 4080 is a high performance graphics card that requires adequate power in order to render extremely detailed graphics for today's games. The technology that allows for such fidelity requires a sufficient power supply, and of course the power supply must have enough capacity to cover the requirements of everything else in your PC, too. before we get into all of that, there are some things to make sure you're covered in terms of the bare minimums.

RTX 4080 SYSTEM REQUIREMENTS

  • PCIE 4.0 X 16 SLOT (For best performance)
  • 850W Power supply or greater.
  • MIN 3 x 8 pin PCIE Connectors + Adapter provided / 450W or greater PCIE GEN 5 power cable.
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RTX 4080 Power Requirements

Of course, when we say RTX 4080, we're actually referring to a broad variety of products all derived from the same standard from our boys at NVIDIA. This means that the specific RTX 4080 you buy can differ considerably from other models. So, here's a non-exhaustive list of some of the most popular RTX 4080 models showing their TDP (Thermal Design Power) and the minimum recommended PSU (As recommended by the manufacturer).

*Power requirements may vary between models, it's recommended to defer to the requirements of your particular graphics card model

Model TDP (Thermal Design Power) Minimum recommended PSU
NVIDIA GeForce RTX 4080 (Founder's Edition) 320W 750W
MSI NVIDIA GeForce RTX™ 4080 16GB SUPRIM X 320W 750W
ASUS NVIDIA GeForce RTX 4080 ProArt OC 16GB 320W 750W
ASUS TUF Gaming GeForce RTX 4080 16GB 320W 750W
ASUS GeForce RTX™ 4080 16GB Noctua OC Edition 320W 750W

Interestingly, the TDP and recommended power supply doesn't seem to vary like it did when we found the best PSU for the RTX 4090. We're not sure why that's this is, but it does mean make finding the best PSU for RTX 4080 a lot easier. However, as we said this is not an exhaustive list, so double the check your particular 4080 just in case.

BEST FULLY MODULAR ATX PSU FOR RTX 4080: CORSAIR RM750X SHIFT

For more traditionally-sized builds in cases like the 4000D or 5000D, a modular power supply with at least 750W such as the RM750x SHIFT will provide the appropriate power needed for the RTX 4080. However, as suggested with our recommendation for small form factor builds, a higher wattage power supply with 850W, 1000W, or higher is recommended if the card will be paired with a high-end processor such as a Ryzen 9 or Intel Core i9, additional considerations may also need to be made if the build is to be equipped with multiple RGB fans and other accessories.

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CORSAIR RM750X SHIFT SPECS

Yes, you can be safe knowing that as long as it's got 750W of power capacity, it'll be good for an RTX 4080, however, it's always nice to know more just in case, so here's the power table and cable configuration for the CORSAIR RM750x SHIFT.

CORSAIR RM750X SHIFT power table
Rail +3.3V +5V +12V +5Vsb
Max current 20A 20A 20A 3A
Max combined wattage 150W 750W 15W
750W
CORSAIR RM750x SHIFT cable configuration
Cable type Description Length Cable Quantity
Flat ATX CABLE 24-PIN (24) 610mm ± 10mm 1
Flat EPS/ATX12V CABLE 8-PIN (4+4) 650mm ± 10mm 2
Flat 12VHPWR Cable (12+4) 650mm ± 10mm 1
Flat PCIe CABLE 8-PIN (6+2) x2 750mm ± 10mm 2
Flat PCIe CABLE 8-PIN (6+2) 650mm ± 10mm 3
Flat SATA CABLE (4 SATA) 800mm ± 10mm 4
Flat PATA CABLE (4-PIN) 750mm ± 10mm 2

BEST FULLY MODULAR SFX PSU FOR RTX 4080: CORSAIR SF850L

For those who like smaller cases like the CORSAIR 2000D, we're of course including the SF850L here. Yes, it's slightly overpowered for the needs of the RTX 4080, but it's better to have too much power instead of too little.

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CORSAIR SF850L SPECS

It's worth noting here that the SF850L does not feature the side-mounted connectors of the RMx SHIFT PSUs. That being said, it doesn't matter much as small form-factor cases don't allow for such features anyway. Let's look at the specs for this one.

CORSAIR RM750X SHIFT power table
Rail +3.3V +5V +12V +5Vsb
Max current 20A 20A 70.8A 3A
Max combined wattage 150W 850W 15W
850W
CORSAIR RM750x SHIFT cable configuration
Cable type Description Length Cable Quantity
Sleeved ATX CABLE 24-PIN (24) 300mm ± 10mm 1
Flat EPS/ATX12V CABLE 8-PIN (4+4) 400mm ± 10mm 2
Flat 12VHPWR Cable (12+4) 400mm ± 10mm 1
Flat PCIe CABLE 8-PIN (6+2) x2 500mm ± 10mm 1
Flat PCIe CABLE 8-PIN (6+2) 400mm ± 10mm 2
Flat SATA CABLE (4 SATA) 445mm ± 10mm 1
Flat PATA CABLE (4-PIN) 330mm ± 10mm 1

BEST ULTRA-QUIET ATX PSU FOR RTX 4080: CORSAIR RM750e

Some PC builder and gamers are unconcerned with noise, but to some they need their PCs to be as quiet as possible. So, we've decided to include one our own ultra low-noise power supplies here, the CORSAIR RM750e.

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CORSAIR RM750e SPECS

The way it keeps the noise so low, by the way, is via the 120mm rifle bearing fan with a specially calculated fan curve. Additionally, it has a zero-RPM mode, so when you're not doing anything too intensive the fan turns off entirely for a truly silent PSU.

CORSAIR RM750e SHIFT power table
Rail +3.3V +5V +12V +5Vsb
Max current 20A 20A 62.5A 3A
Max combined wattage 150W 750W 15W
750W
CORSAIR RM750e SHIFT cable configuration
Cable type Description Length Cable Quantity
Sleeved ATX CABLE 24-PIN (24) 610mm ± 10mm 1
Flat EPS/ATX12V CABLE 8-PIN (4+4) 650mm ± 10mm 2
Flat PCIe CABLE 8-PIN (6+2) x2 600mm ± 10mm 1
Flat PCIe CABLE 8-PIN (6+2) 600mm ± 10mm 1
Flat SATA CABLE (3 SATA) 500mm ± 10mm 1
Flat PATA CABLE (4-PIN) 455mm ± 10mm 1
Flat SATA CABLE (3 SATA) 450mm ± 10mm 1

RTX 4080 PSU FAQs

Ok, we've located our 3 best PSUs for the RTX 4080, but we thought we'd throw a few FAQs we see a lot at the bottom and answer them for you.

How long is the warranty on a CORSAIR PSU?


All our PSUs come with a minimum of a 3-year warranty, with many holding 10-year warranties. You can find the warranty for each specific PSU on our support site.



Are there still issues with the 12VHPWR connector?


Following the release of the 12VHPWR standard, there were some incidences of the connector melting, due to it not being fully-seated when connected. This is avoidable, just make sure the cable is fully connected at both ends, and avoid bending the connector during the cable management process. Our PCIe 5.0 12VHPWR GPU Power Bridge can help with that, allowing for neater cable management, and a lower likelihood of the cable being bent too much. (Just check it will work with your specific RTX 4080.)



What do the "80 Plus" and "Cybenetics" symbols mean?


80 PLUS and Cybenetics are the two most common PSU efficiency ratings. Basically the better the rating, the more efficient the power supply. We've written an article explaining these two standards that you can read for more detail.



Are all PSU cables compatible with all PSUs?


No. there are different standards and connector types at play here. This means you have to be very careful. Check out our compatibility matrix to make sure. Plugging the wrong type of cable into your PSU, or any other component in your system can have disastrous consequences.



Try our Power Supply Calculator

Still not sure which power supply is right for you? Why not try out our Power Supply Calculator. Just choose your components and we will calculate the best PSU for your specific pc setup.

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