Buying Guide
The Best 1000W Power Supplies for High-End Gaming PCs
Six ATX 3.1 units for high-end graphics cards, compared on 12V-2x6 cables, PCIe connectors, fan design, length and warranty.
By The PC Journal editorial team
11 min read6 products evaluated
A 1000W power supply is the usual choice for a high-end graphics card paired with a fast CPU. Check your card maker's recommended wattage first: many high-end cards list 850W or 1000W, and the extra headroom mainly matters if you plan a bigger upgrade.
Our comparison draws on what each maker states in its Amazon listing, from cable counts to fan design; nothing here comes from our own testing, and gaps such as unlisted length or warranty are flagged.
At this wattage, the practical differences are cables and size: how many 12V-2x6 and PCIe connectors each unit ships with, and whether it fits a mid-tower case.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Most GPU Connectors
be quiet! Pure Power 13 M 1000W
The most PCIe 6+2 connectors here (4).
Best for: Graphics cards that still use several 8-pin connectors.
Our take Check price for be quiet! Pure Power 13 M 1000W (opens in a new tab)
Longest Warranty
MSI MPG A1000GS PCIE5 II
The longest warranty in this comparison (10 years).
Best for: Builders who want the longest cover for the money.
Our take Check price for MSI MPG A1000GS PCIE5 II (opens in a new tab)
Largest Fan
NZXT C1000 Gold Core (ATX 3.1)
The largest fan here (135mm).
Best for: Warm cases where airflow through the PSU matters.
Our take Check price for NZXT C1000 Gold Core (ATX 3.1) (opens in a new tab)
Best Cable Routing
CORSAIR RM1000x (ATX 3.1)
Embossed cables with low-profile combs.
Best for: Windowed cases where tidy cables are part of the look.
Our take Check price for CORSAIR RM1000x (ATX 3.1) (opens in a new tab)
Best Budget Pick
Thermaltake Toughpower GT 1000W
The lowest price in this group when we checked.
Best for: Builders who would rather put the savings into the graphics card.
Our take Check price for Thermaltake Toughpower GT 1000W (opens in a new tab)
Best for Fast Wake from Sleep
CORSAIR RM1000e (2025)
Modern Standby support for faster wake from sleep.
Best for: PCs that sleep often and should wake quickly.
Our take Check price for CORSAIR RM1000e (2025) (opens in a new tab)
Our Picks
Most GPU Connectors1 of 6
be quiet! Pure Power 13 M 1000W on Amazon (opens in a new tab)
The be quiet!
Best for
- Graphics cards that still use several 8-pin connectors.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
Pure Power 13 M 1000W is the most flexible 1000W unit here: it has four 8-pin GPU connectors in addition to its native 12V-2x6 cable. It carries a Cybenetics Platinum rating and a fan that stops at low load. That combination suits a high-end card today and leaves room for a different card tomorrow.
The maker doesn't state a warranty term. Its fan stops completely at low load, and LLC topology gives tight voltage regulation for a quiet system. It matches the NZXT C1000 Gold Core on efficiency tier (Platinum).
You also get semi-passive cooling at low load. Count your card's power sockets first: this unit supplies a native 12V-2x6 cable and 4 PCIe 6+2 connectors. If you want a confirmed warranty, look to the MSI MPG A1000GS PCIE5 II instead: it offers 10-year, while this one gives no figure.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Gold, Cybenetics Platinum
- Fan: zero-RPM mode
- GPU cables: 1× 12V-2x6, 4× PCIe 6+2
Pros
- 80 Plus Gold, Cybenetics Platinum efficiency
- Fan stops at low load
- Native 12V-2x6 cable
- 4 PCIe 6+2 connectors
Cons
- No published warranty term
- No Cybenetics noise class
Longest Warranty2 of 6
MSI MPG A1000GS PCIE5 II on Amazon (opens in a new tab)
The MSI MPG A1000GS PCIE5 II is the only unit here with two native 12V-2x6 cables, and it backs them with a 10-year warranty.
Best for
- Builders who want the longest cover for the money.
Skip if
- You want a fan that stops at idle; none is rated for this unit.
Why we like it
It also offers three PCIe 6+2 connectors for AMD cards that use 8-pin sockets, and server-grade 105°C capacitors throughout. It lacks a zero-RPM mode, which the NZXT and be quiet! units include. Its embossed jacket cables bend easily, and eight protections guard the system.
MSI lists RTX 50 series support. It matches the CORSAIR RM1000x and the Thermaltake Toughpower GT 1000W on efficiency tier (Gold). For the graphics card, it has two native 12V-2x6 cables and 3 PCIe 6+2 connectors, so count the sockets on your exact card before buying. There is no published fan size figure, whereas the NZXT C1000 Gold Core comes in at 135mm.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Gold
- GPU cables: 2× 12V-2x6, 3× PCIe 6+2
- Cabling: fully modular
- Warranty: 10 years
Pros
- 80 Plus Gold certified
- 10-year warranty
- Two native 12V-2x6 cables
- 3 PCIe 6+2 connectors
Cons
- No zero-RPM mode
- No Cybenetics noise class
Largest Fan3 of 6
NZXT C1000 Gold Core (ATX 3.1) on Amazon (opens in a new tab)
The NZXT C1000 Gold Core is the quiet pick, with a 135mm fluid dynamic bearing fan, zero-RPM mode and a Cybenetics noise certification listed by NZXT.
Best for
- Warm cases where airflow through the PSU matters.
Skip if
- Look at the other picks if you need a feature not covered above.
Why we like it
Its 80 Plus badge is Gold while Cybenetics rates it Platinum, and the 7-year warranty is shorter than MSI's 10 years. For a high-end build where idle silence matters, it is a strong balance. It uses 105°C-rated capacitors, embossed modular cables and a dual-colour 12V-2x6 connector.
It matches the be quiet! Pure Power 13 M 1000W on efficiency tier (Platinum). Its 135mm fan size is the largest here; the Thermaltake Toughpower GT 1000W comes next at 120mm. If you want a confirmed PCIe 6+2 connector count, look to the be quiet! Pure Power 13 M 1000W instead: it offers 4, while this one gives no figure.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Gold, Cybenetics Platinum
- Fan: 135mm fluid dynamic bearing, zero-RPM mode
- GPU cables: 1× 12V-2x6
- Cabling: fully modular
- Warranty: 7 years
Pros
- 80 Plus Gold, Cybenetics Platinum efficiency
- 7-year warranty
- Fan stops at low load
- Native 12V-2x6 cable
Cons
- No Cybenetics noise class
- Length not published
Best Cable Routing4 of 6
CORSAIR RM1000x (ATX 3.1) on Amazon (opens in a new tab)
The Corsair RM1000x is the neatest unit to wire, with embossed cables and low-profile combs.
Best for
- Windowed cases where tidy cables are part of the look.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
Cybenetics rates it Gold, and it includes a native 12V-2x6 cable. It does not list a zero-RPM mode or warranty term, so buy it for the cable set and Corsair's support rather than on listed features. It is Cybenetics Gold rated at up to 91% efficiency, and its embossed cables with low-profile combs route easily.
On efficiency tier it ties with the MSI MPG A1000GS PCIE5 II and the Thermaltake Toughpower GT 1000W at Gold. Before buying, weigh one limit: no published fan size. Buyers who need a confirmed warranty should compare it with the MSI MPG A1000GS PCIE5 II, which offers 10-year.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: Cybenetics Gold
- GPU cables: 1× 12V-2x6
- Cabling: fully modular
Pros
- Cybenetics Gold certified
- Native 12V-2x6 cable
- Fully modular cables
- Embossed cables with low-profile combs
Cons
- No published warranty term
- No zero-RPM mode
Best Budget Pick5 of 6
Thermaltake Toughpower GT 1000W on Amazon (opens in a new tab)
The Thermaltake Toughpower GT 1000W is the one to pick for a tight case, at 140mm long, which is short for a 1000W unit.
Best for
- Builders who would rather put the savings into the graphics card.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
It uses a hydraulic-bearing 120mm fan with zero-RPM mode and flat cables that route easily. It was the least expensive unit here when we checked, although the maker doesn't state a warranty term. Its flat modular cables have colour-matched connectors, and a hydraulic-bearing fan with Smart Zero Fan keeps it quiet.
On efficiency tier it ties with the MSI MPG A1000GS PCIE5 II and the CORSAIR RM1000x at Gold. On fan size it ties with the CORSAIR RM1000e at 120mm. Compare its 140mm length with your case's maximum PSU length, leaving room for the modular plugs. If efficiency tier is your priority, the be quiet! Pure Power 13 M 1000W (Platinum) is the stronger choice.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Gold
- Length: 140mm
- Fan: 120mm hydraulic bearing, zero-RPM mode
- GPU cables: 1× 12V-2x6
- Cabling: fully modular
Pros
- 80 Plus Gold certified
- Fan stops at low load
- Native 12V-2x6 cable
- Short 140mm body
Cons
- No published warranty term
- No Cybenetics noise class
Best for Fast Wake from Sleep6 of 6
CORSAIR RM1000e (2025) on Amazon (opens in a new tab)
The Corsair RM1000e adds Modern Standby support to a fully modular 1000W unit with 105°C-rated capacitors.
Best for
- PCs that sleep often and should wake quickly.
Skip if
- You prefer a fluid dynamic bearing fan for long service life.
Why we like it
Its rifle-bearing fan and unlisted efficiency tier put it behind the other units on paper, and it costs about the same as the be quiet!. It makes sense mainly for Corsair-based builds that sleep often. A 120mm rifle-bearing fan follows a quiet fan curve even at full load, and it is Intel ATX 3.1 certified.
Its fully modular cabling keeps builds tidy. On fan size it ties with the Thermaltake Toughpower GT 1000W at 120mm. The maker doesn't give its efficiency tier; if that figure matters, the be quiet! Pure Power 13 M 1000W offers Platinum.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Fan: 120mm rifle bearing
- Cabling: fully modular
Pros
- Fully modular cables
- 105°C-rated capacitors
- Modern Standby support
Cons
- Rifle-bearing fan
- No published warranty term
- No zero-RPM mode
How We Chose These 1000W Power Supplies
Each pick was assessed across 4 criteria weighted for real-world use.
- Fan and noise
- We noted fan size, bearing type, zero-RPM modes and any listed Cybenetics noise rating.
- Physical fit
- We noted form factor and depth where listed, since case clearance rules units out before any other factor.
- Connectors
- We checked each unit's native 12V-2x6 cable and PCIe connectors where the listing states them, since they decide which graphics cards it can power without adapters.
- Efficiency certification
- We recorded each efficiency certification, separating 80 Plus from Cybenetics ratings.
What to Look for in 1000W Power Supplies
Key buying criteria so you get the right fit the first time.
Use the GPU maker's recommended wattage
The simplest sizing rule is the recommended PSU wattage on your graphics card's spec page. Partner cards sometimes ask for more than the reference design.
Buying far above that figure adds cost without adding performance.
Warranty length signals confidence
Warranties on these units run from five to ten years where the maker states one. A longer term does not prove quality, but it shows how long the maker expects to support the unit.
Where a listing gives no term, check the maker's site before buying.
Zero-RPM mode for a quiet idle
Many units stop their fan at light load and spin it up as demand rises. That keeps a PC silent during browsing and office work.
Listings call it zero-RPM, semi-passive, hybrid or Smart Zero Fan; check that the unit you choose has it if idle noise matters.
Never reuse old modular cables
Modular cables share a plug at the component end, but the pinout at the power supply end differs between brands and even between models. Corsair's cable-compatibility guidance warns against mixing them.
A cable from an old unit can damage drives, the motherboard or the graphics card.
Same name, different generation
Power supply names often carry over between generations, with ATX 3.0 and ATX 3.1 versions sold side by side. The newer version has the 12V-2x6 socket.
Check for ATX 3.1 and the model year in the listing title.
Measure the PSU bay first
The PSU bay limits length, not just form factor. Leave space behind the unit for cable plugs and any bottom-mounted fan.
If your case manual offers a maximum PSU length, compare it with the unit's depth before anything else.
How to Choose 1000W Power Supplies
By priority
| Priority | Consider | Why |
|---|---|---|
| Graphics cards that still use several 8-pin connectors | be quiet! Pure Power 13 M 1000W | The most PCIe 6+2 connectors here (4) |
| Builders who want the longest cover for the money | MSI MPG A1000GS PCIE5 II | The longest warranty in this comparison (10 years) |
| Warm cases where airflow through the PSU matters | NZXT C1000 Gold Core | The largest fan here (135mm) |
| Windowed cases where tidy cables are part of the look | CORSAIR RM1000x | Embossed cables with low-profile combs |
| Builders who would rather put the savings into the graphics card | Thermaltake Toughpower GT 1000W | The lowest price in this group when we checked |
| PCs that sleep often and should wake quickly | CORSAIR RM1000e | Modern Standby support for faster wake from sleep |
Scroll sideways to see every column.
By graphics card cables
Counts as stated in each listing; check your card's power sockets against them.
| Power supply | Native 12V-2x6 | PCIe 6+2 |
|---|---|---|
| be quiet! Pure Power 13 M 1000W | 1 | 4 |
| MSI MPG A1000GS PCIE5 II | 2 | 3 |
| NZXT C1000 Gold Core | 1 | Not listed |
| CORSAIR RM1000x | 1 | Not listed |
| Thermaltake Toughpower GT 1000W | 1 | Not listed |
| CORSAIR RM1000e | Not listed | 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 $70 to $100 | Thermaltake Toughpower GT 1000W |
| About $100 to $150 | MSI MPG A1000GS PCIE5 II, NZXT C1000 Gold Core, CORSAIR RM1000x, be quiet! Pure Power 13 M 1000W, CORSAIR RM1000e |
Frequently Asked Questions
Is a bigger power supply less efficient at low load?
Very large units can be less efficient at light loads. Choose wattage from your card maker's guidance rather than buying the largest available.
What does zero-RPM mode mean?
The fan stays off until the load or temperature rises, so the unit is silent during light work.
Can I reuse cables from my old power supply?
No. Pinouts at the PSU end differ between brands and models, and a mismatched cable can damage components. Use the cables that come with the new unit.
Does higher efficiency make my PC faster?
No. Efficiency affects heat, noise and running cost, not performance.
Can I use an adapter instead of a native 12V-2x6 cable?
You can, but a native cable avoids an extra connection point. Where a unit includes a native cable, use it.
Why would I need two 12V-2x6 cables?
Mainly for two high-power graphics cards or workstation builds. Most single-GPU systems need one.
Bottom Line
The be quiet! Pure Power 13 M 1000W is the most flexible pick, with four PCIe connectors plus a native 12V-2x6 and a Cybenetics Platinum rating. The MSI MPG A1000GS PCIE5 II is the choice for two 12V-2x6 cables and a 10-year warranty, and the NZXT C1000 Gold Core adds a 135mm FDB fan with zero-RPM mode.
The Thermaltake Toughpower GT 1000W is the one to pick for a tight case at 140mm, the Corsair RM1000x has the tidiest cables, and the RM1000e adds Modern Standby support.