Buying Guide
The Best Power Supplies for the RTX 4080 Super
Six 750W and 850W units with native 12V-2x6 cables for the RTX 4080 Super, weighted toward 850W for builds with a high-power CPU.
By The PC Journal editorial team
12 min read6 products evaluated
NVIDIA recommends a 750W power supply for the RTX 4080 Super, which uses a single 16-pin connector. This guide leans toward 850W because many 4080 Super builds pair it with a high-power CPU.
We compared wattage, connectors and ratings from the power supply listings against NVIDIA's guidance; we did not load-test these units.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Most Efficient 850W
be quiet! Power Zone 2 850W
Platinum ratings from both 80 Plus and Cybenetics.
Best for: Quiet, efficient builds.
Our take Check price for be quiet! Power Zone 2 850W (opens in a new tab)
Shortest 850W
Super Flower Leadex VIII Platinum PRO 850W
A 125mm depth, the shortest here.
Best for: Cases with a cramped PSU bay.
Our take Check price for Super Flower Leadex VIII Platinum PRO 850W (opens in a new tab)
Best White Pick
ASRock Steel Legend SL-850GW White
A white 850W unit with a 10-year warranty.
Best for: White builds.
Our take Check price for ASRock Steel Legend SL-850GW White (opens in a new tab)
Best Budget 850W
darkFlash DG850
850W with a native 12V-2x6 cable in a 140mm body.
Best for: Keeping cost down.
Our take Check price for darkFlash DG850 (opens in a new tab)
Best for Power Spikes
Rosewill VMG 850W
Support for large GPU power spikes on an 850W Gold unit.
Best for: High-power CPU and GPU pairs.
Our take Check price for Rosewill VMG 850W (opens in a new tab)
Best 750W Option
be quiet! Pure Power 13 M 750W
750W with Cybenetics Platinum and four PCIe 8-pin connectors.
Best for: Builds with a 65W or 120W CPU.
Our take Check price for be quiet! Pure Power 13 M 750W (opens in a new tab)
Our Picks
Most Efficient 850W1 of 6
be quiet! Power Zone 2 850W on Amazon (opens in a new tab)
be quiet!'s Power Zone 2 850W carries Platinum ratings from both 80 Plus and Cybenetics, three PCIe 8-pin connectors and a native 12V-2x6.
Best for
- Quiet, efficient builds.
Skip if
- Its warranty is not published, which rules it out if you need that number.
Why we like it
Its 140mm fan stops at low load. On rated output it ties with the Super Flower Leadex VIII Platinum PRO 850W, the ASRock Steel Legend SL-850GW White, the darkFlash DG850 and the Rosewill VMG 850W at 850W. You get a platinum 80 plus rating here, which sets it apart from the be quiet! Pure Power 13 M 750W and its a gold 80 plus rating.
No depth is rated for the be quiet! Power Zone 2 850W, so check the maker's page against your case's PSU bay. On price it sat fifth of 6, between the cheaper be quiet! Pure Power 13 M 750W and the pricier Super Flower Leadex VIII Platinum PRO 850W, at the time of writing. The maker doesn't give its warranty; if that figure matters, the ASRock Steel Legend SL-850GW White offers 10 years.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 3
- 80 Plus rating: Platinum
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Fan: 140mm
- Fan stop: Yes
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- 80 Plus Platinum efficiency
- ATX 3.1 compliance
Cons
- No published warranty
- No published depth
- Costs more than the darkFlash DG850 at the time of writing
Shortest 850W2 of 6
Super Flower Leadex VIII Platinum PRO 850W on Amazon (opens in a new tab)
Super Flower's Leadex VIII Platinum PRO 850W is 125mm deep, which Super Flower calls the smallest 850W Platinum ATX unit.
Best for
- Cases with a cramped PSU bay.
Skip if
- Skip it if you need to know its warranty before buying; the maker doesn't publish one.
Why we like it
It has a native 12V-2x6 cable and braided ribbon cables. It matches the be quiet! Power Zone 2 850W, the ASRock Steel Legend SL-850GW White, the darkFlash DG850 and the Rosewill VMG 850W on rated output (850W). Its 125mm depth is the shallowest here; the darkFlash DG850 comes next at 140mm.
The Super Flower Leadex VIII Platinum PRO 850W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. At 125mm deep, compare it with your case's PSU clearance before buying. At our last price check it topped the group, with the be quiet! Power Zone 2 850W the nearest cheaper option. If you want a confirmed 8-pin PCIe connector count, look to the be quiet! Pure Power 13 M 750W instead: it offers 4, while this one gives no figure.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- Depth: 125mm
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 120mm
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- A short 125mm body
- ATX 3.1 compliance
Cons
- No published warranty
- Costs more than the darkFlash DG850 at the time of writing
Best White Pick3 of 6
ASRock Steel Legend SL-850GW White on Amazon (opens in a new tab)
ASRock's Steel Legend SL-850GW is a white 850W unit, 150mm deep, with a dual-color 12V-2x6 cable and a 10-year warranty.
Best for
- White builds.
Skip if
- Skip it if depth matters most to you; the Super Flower Leadex VIII Platinum PRO 850W offers 125mm.
Why we like it
Its compact 150mm-deep body helps in smaller cases, and iCOOL fan control adjusts speed to load. The white finish suits light builds. It matches the be quiet! Power Zone 2 850W, the Super Flower Leadex VIII Platinum PRO 850W, the darkFlash DG850 and the Rosewill VMG 850W on rated output (850W).
On warranty it leads this guide at 10 years, ahead of the darkFlash DG850 (5 years). Its 150mm depth is the deepest in this group; the Super Flower Leadex VIII Platinum PRO 850W leads at 125mm. No other pick in this guide offers a white colour; compare the be quiet! Pure Power 13 M 750W, which has a black colour.
It was priced above the Rosewill VMG 850W and below the be quiet! Pure Power 13 M 750W at the time of writing. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 13 M 750W offers 4.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- Warranty: 10 years
- Depth: 150mm
- 80 Plus rating: Gold
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 135mm
- Colour: White
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- A 10-year warranty
- ATX 3.1 compliance
Cons
- Depth trails the Super Flower Leadex VIII Platinum PRO 850W (125mm)
- Costs more than the darkFlash DG850 at the time of writing
Best Budget 850W4 of 6
darkFlash DG850 on Amazon (opens in a new tab)
darkFlash's DG850 fits 850W into a 140mm body, with a native 12V-2x6 cable and fully modular cables.
Best for
- Keeping cost down.
Skip if
- Look at the others if this bothers you: a shorter 5-year warranty.
Why we like it
Its warranty is 5 years. It is fully modular with a quiet HDB fan, and it carries a 5-year limited warranty with built-in protections. Its 850W output suits high-end CPU and GPU builds.
It matches the be quiet! Power Zone 2 850W, the Super Flower Leadex VIII Platinum PRO 850W, the ASRock Steel Legend SL-850GW White and the Rosewill VMG 850W on rated output (850W). On warranty it ties with the Rosewill VMG 850W at 5 years. Its 140mm depth ranks second of 3 here, behind the Super Flower Leadex VIII Platinum PRO 850W (125mm) and ahead of the ASRock Steel Legend SL-850GW White (150mm).
You also get multi-protection circuitry. It cost the least of the 6 picks at the time of writing, with the Rosewill VMG 850W the next step up. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 13 M 750W offers 4.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- Warranty: 5 years
- Depth: 140mm
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- A short 140mm body
- ATX 3.1 compliance
Cons
- A shorter 5-year warranty
- Warranty of 5 years, behind the ASRock Steel Legend SL-850GW White (10 years)
Best for Power Spikes5 of 6
Rosewill VMG 850W on Amazon (opens in a new tab)
Rosewill's VMG 850W offers a native 12V-2x6 cable and support for large GPU power spikes, on a fully modular 80 Plus Gold design.
Best for
- High-power CPU and GPU pairs.
Skip if
- Pass on it if a shorter 5-year warrant rules it out for your setup.
Why we like it
Its compact 140mm-deep chassis is 35% smaller than a standard ATX unit, which helps in small cases. Six protections guard against overcurrent, overpower, overtemperature, overvoltage, short circuit and undervoltage. Its steel shell has large vents, and a 120mm FDB fan handles cooling.
It matches the be quiet! Power Zone 2 850W, the Super Flower Leadex VIII Platinum PRO 850W, the ASRock Steel Legend SL-850GW White and the darkFlash DG850 on rated output (850W). On warranty it ties with the darkFlash DG850 at 5 years. The Rosewill VMG 850W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
It was priced above the darkFlash DG850 and below the ASRock Steel Legend SL-850GW White at the time of writing. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 13 M 750W offers 4.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- Warranty: 5 years
- 80 Plus rating: Gold
- Form factor: ATX
- Cabling: Fully modular
- Fan: 120mm
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- Fully modular cables
- Listed support for large GPU power excursions
Cons
- A shorter 5-year warranty
- Warranty trails the ASRock Steel Legend SL-850GW White (10 years)
- No published depth
Best 750W Option6 of 6
be quiet! Pure Power 13 M 750W on Amazon (opens in a new tab)
be quiet!'s Pure Power 13 M 750W offers four PCIe 8-pin connectors plus a native 12V-2x6, and its fan switches off at low load.
Best for
- Builds with a 65W or 120W CPU.
Skip if
- Skip it if rated output matters most to you; the be quiet! Power Zone 2 850W offers 850W.
Why we like it
Cybenetics rates it Platinum. Its fan stops completely at low load, and one strong 12V rail handles GPU power spikes. LLC topology gives tight voltage regulation.
On rated output it trails the group at 750W, while the be quiet! Power Zone 2 850W offers 850W. No depth is rated for the be quiet! Pure Power 13 M 750W, so check the maker's page against your case's PSU bay. It also brings ATX 3.1 compliance. Its price falls between the ASRock Steel Legend SL-850GW White and the be quiet! Power Zone 2 850W, based on our last check.
Key dimensions & specs
- Wattage: 750W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 4
- 80 Plus rating: Gold
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Fan stop: Yes
- Colour: Black
Pros
- A 750W rating
- A native 12V-2x6 cable for 16-pin cards
- 4 PCIe 8-pin connectors for older cards
- ATX 3.1 compliance
Cons
- Rated output trails the be quiet! Power Zone 2 850W (850W)
- No published warranty
- No published depth
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Wattage
- We compared rated output with NVIDIA's or AMD's recommended system power for the card.
- Standards
- We noted ATX version, 80 Plus and Cybenetics ratings.
- Price
- We grouped picks by price at the time of writing.
- Connectors
- We recorded native 12V-2x6 cables and PCIe 8-pin connectors where the listing states them.
What to Look for in a PSUs for RTX 4080 Super
Key buying criteria so you get the right fit the first time.
Start from the card maker's PSU figure
NVIDIA and AMD publish a recommended total system power for each card, and partner cards often state their own. Treat that figure as the floor, then add headroom for a high-power CPU.
More wattage than you need does not harm anything; it mostly costs money.
Compare efficiency ratings
80 Plus and Cybenetics ratings describe how much power turns into heat. Gold is the usual target for a gaming PC; Platinum and Titanium run cooler and cost more.
Check depth and cabling
Deeper units can clash with drive cages or front radiators. Fully modular cables make routing easier in tight cases.
Prefer ATX 3.1
ATX 3.1 units are designed for the brief power spikes modern graphics cards produce and ship with the revised 12V-2x6 connector. Older units can still work, but check the maker's guidance for your card.
Use the warranty as a quality signal
Long warranties of seven to twelve years show how long a maker expects a unit to last. A power supply often moves from one build to the next, so the warranty matters.
Match the power connector
Most RTX 40 and RTX 50 cards use a single 16-pin 12V-2x6 (12VHPWR) plug, while many Radeon cards use two or three 8-pin plugs. A native cable avoids bulky adapters.
Push the 16-pin plug fully home and avoid a sharp bend right at the connector.
How to Choose a PSUs for RTX 4080 Super
By priority
| Priority | Consider | Why |
|---|---|---|
| Quiet, efficient builds | be quiet! Power Zone 2 850W | Platinum ratings from both 80 Plus and Cybenetics |
| Cases with a cramped PSU bay | Super Flower Leadex VIII Platinum PRO 850W | A 125mm depth, the shortest here |
| White builds | ASRock Steel Legend SL-850GW White | A white 850W unit with a 10-year warranty |
| Keeping cost down | darkFlash DG850 | 850W with a native 12V-2x6 cable in a 140mm body |
| High-power CPU and GPU pairs | Rosewill VMG 850W | Support for large GPU power spikes on an 850W Gold unit |
| Builds with a 65W or 120W CPU | be quiet! Pure Power 13 M 750W | 750W with Cybenetics Platinum and four PCIe 8-pin connectors |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Power supplie | Wattage | Native 12V-2x6 cables | PCIe 8-pin connectors | Warranty |
|---|---|---|---|---|
| be quiet! Power Zone 2 850W | 850W | 1 | 3 | Not listed |
| Super Flower Leadex VIII Platinum PRO 850W | 850W | 1 | Not listed | Not listed |
| ASRock Steel Legend SL-850GW White | 850W | 1 | Not listed | 10 years |
| darkFlash DG850 | 850W | 1 | Not listed | 5 years |
| Rosewill VMG 850W | 850W | 1 | Not listed | 5 years |
| be quiet! Pure Power 13 M 750W | 750W | 1 | 4 | Not listed |
Scroll sideways to see every column.
By price at the time of writing
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| Price tier | Power supplies |
|---|---|
| About $50 to $100 | darkFlash DG850, Rosewill VMG 850W, ASRock Steel Legend SL-850GW White, be quiet! Pure Power 13 M 750W |
| About $100 to $150 | be quiet! Power Zone 2 850W, Super Flower Leadex VIII Platinum PRO 850W |
Frequently Asked Questions
Can I reuse the power supply from my old PC?
Only if it meets the card's wattage and connector needs and is still under warranty or in good health. Very old units lack modern connectors.
Does a Platinum unit save much on electricity?
Only a little for most gaming PCs. The main gains are less heat and often a quieter fan.
Can I use the 16-pin adapter that came with my graphics card?
Yes, if it is the maker's own adapter and every 8-pin plug on it is connected. A native 12V-2x6 cable is tidier and has fewer joins.
How much headroom should I leave above the recommended wattage?
The card maker's figure already covers a typical system. Add 100 to 150W if you run a high-power CPU or plan a bigger card later.
Is an ATX 3.0 power supply still fine?
Generally yes. ATX 3.1 mainly revises the connector to 12V-2x6 and relaxes some spike requirements; check your unit's cable is rated for your card.
Can I use an SFX power supply?
Yes, if the case supports SFX and the unit meets the wattage and connector needs of your card. SFX units cost more per watt.
Bottom Line
be quiet!'s Power Zone 2 850W is the efficient choice for an RTX 4080 Super. Super Flower's Leadex VIII suits shallow PSU bays, ASRock's SL-850GW suits white builds, and darkFlash's DG850 keeps cost down.