Buying Guide
The Best Power Supplies for the RTX 5080
Six 850W and 1000W units with native 12V-2x6 cables, matched to NVIDIA's 850W recommendation for the RTX 5080.
By The PC Journal editorial team
12 min read6 products evaluated
NVIDIA recommends an 850W power supply for the RTX 5080, which uses a single 16-pin 12V-2x6 connector. Every unit here offers a native 12V-2x6 cable.
We compared wattage, connectors and ratings from the power supply listings against the card maker's guidance; we did not load-test these units.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Best Match for an RTX 5080
ASRock Steel Legend SL-850GW White
850W with a dual-color 12V-2x6 cable and a 10-year warranty.
Best for: Most RTX 5080 builds, including white ones.
Our take Check price for ASRock Steel Legend SL-850GW White (opens in a new tab)
Best Single-Rail Pick
Thermaltake Toughpower GT 850W
A single high-amperage 12V rail with Smart Zero Fan.
Best for: Simple, quiet builds.
Our take Check price for Thermaltake Toughpower GT 850W (opens in a new tab)
Most Efficient 850W
be quiet! Power Zone 2 850W
Platinum ratings from 80 Plus and Cybenetics.
Best for: Long gaming sessions.
Our take Check price for be quiet! Power Zone 2 850W (opens in a new tab)
Best Compact 850W
darkFlash DG850
850W in a 140mm body.
Best for: Cases with short PSU bays.
Our take Check price for darkFlash DG850 (opens in a new tab)
Best Headroom Pick
CORSAIR RM1000x (ATX 3.1)
1000W with a Cybenetics Gold rating.
Best for: High-power CPUs.
Our take Check price for CORSAIR RM1000x (ATX 3.1) (opens in a new tab)
Best Budget 850W
Rosewill VMG 850W
850W Gold with support for GPU power spikes.
Best for: Keeping cost down.
Our take Check price for Rosewill VMG 850W (opens in a new tab)
Our Picks
Best Match for an RTX 50801 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
- Most RTX 5080 builds, including white ones.
Skip if
- Price-first buyers should look at the darkFlash DG850, which cost less when we checked.
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. On rated output it ties with the Thermaltake Toughpower GT 850W, the be quiet! Power Zone 2 850W, the darkFlash DG850 and the Rosewill VMG 850W at 850W.
Its 10 years warranty is the longest here; the Thermaltake Toughpower GT 850W comes next at 5 years. Like the be quiet! Power Zone 2 850W, it has a platinum cybenetics rating, while the CORSAIR RM1000x uses a gold cybenetics rating. A white colour is unique to it among these picks, while the Thermaltake Toughpower GT 850W uses a black colour.
The ASRock Steel Legend SL-850GW White comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. Its price falls between the Thermaltake Toughpower GT 850W and the CORSAIR RM1000x, based on our last check.
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
- Costs more than the darkFlash DG850 at the time of writing
Best Single-Rail Pick2 of 6
Thermaltake Toughpower GT 850W on Amazon (opens in a new tab)
Thermaltake's Toughpower GT 850W is a fully modular ATX 3.1 unit with a native 12V-2x6 cable, a single high-amperage 12V rail and a Smart Zero Fan mode.
Best for
- Simple, quiet builds.
Skip if
- Pass on it if a shorter 5-year warrant rules it out for your setup.
Why we like it
Smart Zero Fan keeps the fan off at low load, and its low-profile flat black cables are easy to route. It is 80 Plus Gold rated at up to 90% efficiency. On rated output it ties with the ASRock Steel Legend SL-850GW White, the be quiet! Power Zone 2 850W, the darkFlash DG850 and the Rosewill VMG 850W at 850W.
It matches the darkFlash DG850 and the Rosewill VMG 850W on warranty (5 years). The Thermaltake Toughpower GT 850W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the Thermaltake Toughpower GT 850W, so check the maker's page against your case's PSU bay.
Its price falls between the Rosewill VMG 850W and the ASRock Steel Legend SL-850GW White, based on our last check. Buyers who need a confirmed depth should compare it with the darkFlash DG850, which comes in at 140mm.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- Warranty: 5 years
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan stop: Yes
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Fully modular cables
Cons
- A shorter 5-year warranty
- Costs more than the darkFlash DG850 at the time of writing
Most Efficient 850W3 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
- Long gaming sessions.
Skip if
- Skip it if you need to know its warranty before buying; the maker doesn't publish one.
Why we like it
Its 140mm fan stops at low load. It matches the ASRock Steel Legend SL-850GW White, the Thermaltake Toughpower GT 850W, the darkFlash DG850 and the Rosewill VMG 850W on rated output (850W). It is the only pick here with a platinum 80 plus rating; the ASRock Steel Legend SL-850GW White has a gold 80 plus rating instead.
No depth is rated for the be quiet! Power Zone 2 850W, so check the maker's page against your case's PSU bay. At our last price check it topped the group, with the CORSAIR RM1000x the nearest cheaper option. If you want a confirmed warranty, look to the ASRock Steel Legend SL-850GW White instead: it offers 10 years, while this one gives no figure.
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
- Costs more than the darkFlash DG850 at the time of writing
Best Compact 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
- Cases with short PSU bays.
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.
On rated output it ties with the ASRock Steel Legend SL-850GW White, the Thermaltake Toughpower GT 850W, the be quiet! Power Zone 2 850W and the Rosewill VMG 850W at 850W. It also comes with multi-protection circuitry. The darkFlash DG850 comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
At 140mm deep, compare it with your case's PSU clearance before buying. It was the cheapest of the group when we checked; the Rosewill VMG 850W was the next step up. The main gap: rated output of 850W, behind the CORSAIR RM1000x (1000W). If that matters, the CORSAIR RM1000x offers 1000W.
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
- Rated output of 850W, behind the CORSAIR RM1000x (1000W)
Best Headroom Pick5 of 6
CORSAIR RM1000x (ATX 3.1) on Amazon (opens in a new tab)
Corsair's RM1000x is a fully modular ATX 3.1 unit with a native 12V-2x6 cable and Cybenetics Gold efficiency.
Best for
- High-power CPUs.
Skip if
- Its warranty is not published, which rules it out if you need that number.
Why we like it
Its embossed cables come with low-profile combs for tidy routing. It is Cybenetics Gold rated at up to 91% efficiency, and its embossed cables with low-profile combs route easily. Nothing else here matches its 1000W rated output; the ASRock Steel Legend SL-850GW White comes closest at 850W.
No other pick in this guide offers a gold cybenetics rating; compare the ASRock Steel Legend SL-850GW White, which has a platinum cybenetics rating. The CORSAIR RM1000x comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the CORSAIR RM1000x, so check the maker's page against your case's PSU bay.
On price it sat fifth of 6, between the cheaper ASRock Steel Legend SL-850GW White and the pricier be quiet! Power Zone 2 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: 1000W
- Native 12V-2x6 cables: 1
- Cybenetics rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Colour: Black
Pros
- 1000W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Fully modular cables
Cons
- No published warranty
- Costs more than the darkFlash DG850 at the time of writing
Best Budget 850W6 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
- Keeping cost down.
Skip if
- Choose another pick if you can't accept this: a shorter 5-year warranty.
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.
On rated output it ties with the ASRock Steel Legend SL-850GW White, the Thermaltake Toughpower GT 850W, the be quiet! Power Zone 2 850W and the darkFlash DG850 at 850W. It matches the Thermaltake Toughpower GT 850W and the darkFlash DG850 on warranty (5 years). The Rosewill VMG 850W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
No depth is rated for the Rosewill VMG 850W, so check the maker's page against your case's PSU bay. Its price falls between the darkFlash DG850 and the Thermaltake Toughpower GT 850W, based on our last check. If rated output is your priority, the CORSAIR RM1000x (1000W) is the stronger choice.
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
- Rated output trails the CORSAIR RM1000x (1000W)
- Warranty trails the ASRock Steel Legend SL-850GW White (10 years)
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Build and warranty
- We checked depth, modular cabling, fan-stop modes and warranty length.
- Wattage
- We compared rated output with NVIDIA's or AMD's recommended system power for the card.
- Connectors
- We recorded native 12V-2x6 cables and PCIe 8-pin connectors where the listing states them.
- Price
- We grouped picks by price at the time of writing.
What to Look for in a PSUs for RTX 5080
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.
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.
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.
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.
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.
How to Choose a PSUs for RTX 5080
By priority
| Priority | Consider | Why |
|---|---|---|
| Most RTX 5080 builds, including white ones | ASRock Steel Legend SL-850GW White | 850W with a dual-color 12V-2x6 cable and a 10-year warranty |
| Simple, quiet builds | Thermaltake Toughpower GT 850W | A single high-amperage 12V rail with Smart Zero Fan |
| Long gaming sessions | be quiet! Power Zone 2 850W | Platinum ratings from 80 Plus and Cybenetics |
| Cases with short PSU bays | darkFlash DG850 | 850W in a 140mm body |
| High-power CPUs | CORSAIR RM1000x | 1000W with a Cybenetics Gold rating |
| Keeping cost down | Rosewill VMG 850W | 850W Gold with support for GPU power spikes |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Power supplie | Wattage | Native 12V-2x6 cables | Warranty | Depth |
|---|---|---|---|---|
| ASRock Steel Legend SL-850GW White | 850W | 1 | 10 years | 150mm |
| Thermaltake Toughpower GT 850W | 850W | 1 | 5 years | Not listed |
| be quiet! Power Zone 2 850W | 850W | 1 | Not listed | Not listed |
| darkFlash DG850 | 850W | 1 | 5 years | 140mm |
| CORSAIR RM1000x | 1000W | 1 | Not listed | Not listed |
| Rosewill VMG 850W | 850W | 1 | 5 years | 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, Thermaltake Toughpower GT 850W, ASRock Steel Legend SL-850GW White |
| About $100 to $150 | CORSAIR RM1000x, be quiet! Power Zone 2 850W |
Frequently Asked Questions
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.
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.
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.
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.
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.
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.
Bottom Line
ASRock's Steel Legend SL-850GW is the best-matched unit for an RTX 5080, with a 10-year warranty. be quiet!'s Power Zone 2 is the efficient choice, darkFlash's DG850 suits short bays, and Corsair's RM1000x adds headroom.