Buying Guide
The Best PSUs for Heavy Workloads
From the NZXT C1000 Gold Core to the ASUS ROG Strix 1000W Platinum: five power supplies ranked on rated output and native 12V-2x6 cable count, with who should skip each one.
By The PC Journal editorial team
12 min read5 products evaluated
Under constant load, efficiency means less heat and a quieter fan. Every pick is 1000W or more with a Platinum or Titanium rating.
This is a research roundup, not a lab test: wattage, native 12V-2x6 cables and PCIe 8-pin connectors come from each maker's published specs; nothing here was tested in-house, and a missing native 12V-2x6 cables is flagged, not filled in.
Quick Picks
Our 5 recommendations at a glance. Tap a pick for the full verdict.
Lowest Price Here
NZXT C1000 Gold Core (ATX 3.1)
The cheapest way into this group, below the be quiet! Pure Power 13 M 1000W.
Best for: Getting Cybenetics noise certification listed by NZXT for the least money.
Our take Check price for NZXT C1000 Gold Core (ATX 3.1) (opens in a new tab)
Also Consider
be quiet! Pure Power 13 M 1000W
Four PCIe 6+2 connectors plus a native 12V-2x6.
Best for: Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Our take Check price for be quiet! Pure Power 13 M 1000W (opens in a new tab)
Strong Alternative
ASRock Steel Legend SL-1200G
A Cybenetics LAMBDA A noise certification.
Best for: Buyers who want Cybenetics LAMBDA A noise certification.
Our take Check price for ASRock Steel Legend SL-1200G (opens in a new tab)
Worth a Look
be quiet! Pure Power 13 M 1200W
Four PCIe 6+2 connectors plus a native 12V-2x6.
Best for: Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Our take Check price for be quiet! Pure Power 13 M 1200W (opens in a new tab)
Premium Pick
ASUS ROG Strix 1000W Platinum
The top of this price range, adding GaN MOSFETs.
Best for: Spending more for the fullest feature set.
Our take Check price for ASUS ROG Strix 1000W Platinum (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| The cheapest way into this group, below the be quiet! Pure Power 13 M 1000W. | Getting Cybenetics noise certification listed by NZXT for the least money. | Check price for NZXT C1000 Gold Core (ATX 3.1) (opens in a new tab) |
| Four PCIe 6+2 connectors plus a native 12V-2x6. | Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6. | Check price for be quiet! Pure Power 13 M 1000W (opens in a new tab) |
| A Cybenetics LAMBDA A noise certification. | Buyers who want Cybenetics LAMBDA A noise certification. | Check price for ASRock Steel Legend SL-1200G (opens in a new tab) |
| Four PCIe 6+2 connectors plus a native 12V-2x6. | Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6. | Check price for be quiet! Pure Power 13 M 1200W (opens in a new tab) |
| The top of this price range, adding GaN MOSFETs. | Spending more for the fullest feature set. | Check price for ASUS ROG Strix 1000W Platinum (opens in a new tab) |
Our Picks
Lowest Price Here1 of 5
NZXT C1000 Gold Core (ATX 3.1) on Amazon (opens in a new tab)
NZXT's C1000 Gold Core is a fully modular ATX 3.1 unit with a native 12V-2x6 cable, a 7-year warranty and a 135mm fan with a zero-RPM mode.
Best for
- Getting Cybenetics noise certification listed by NZXT for the least money.
Skip if
- Skip it if warranty matters most to you; the ASRock Steel Legend SL-1200G offers 10 years.
Why we like it
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 and the ASUS ROG Strix 1000W Platinum on rated output (1000W). On warranty it trails the group at 7 years, while the ASRock Steel Legend SL-1200G offers 10 years.
It also comes with Cybenetics noise certification listed by NZXT. No depth is rated for the NZXT C1000 Gold Core, so check the maker's page against your case's PSU bay. It cost the least of the 5 picks at the time of writing, with the be quiet! Pure Power 13 M 1000W the next step up. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 13 M 1000W offers 4.
Key dimensions & specs
- Wattage: 1000W
- Native 12V-2x6 cables: 1
- Warranty: 7 years
- 80 Plus rating: Gold
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 135mm
- Fan stop: Yes
- 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
- Warranty trails the ASRock Steel Legend SL-1200G (10 years)
Also Consider2 of 5
be quiet! Pure Power 13 M 1000W on Amazon (opens in a new tab)
be quiet!'s Pure Power 13 M 1000W offers four PCIe 8-pin connectors plus a native 12V-2x6, and Cybenetics rates it Platinum.
Best for
- Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Skip if
- Pass if a published warranty matters; this one has none.
Why we like it
The fan stops at low load. 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 and the ASUS ROG Strix 1000W Platinum on rated output (1000W).
You also get semi-passive cooling at low load. No depth is rated for the be quiet! Pure Power 13 M 1000W, so check the maker's page against your case's PSU bay. It was priced above the NZXT C1000 Gold Core and below the ASRock Steel Legend SL-1200G at the time of writing. There is no published warranty figure, whereas the ASRock Steel Legend SL-1200G offers 10 years.
Key dimensions & specs
- Wattage: 1000W
- 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
- 1000W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- 4 PCIe 8-pin connectors for older cards
- ATX 3.1 compliance
Cons
- No published warranty
- Costs more than the NZXT C1000 Gold Core at the time of writing
Strong Alternative3 of 5
ASRock Steel Legend SL-1200G on Amazon (opens in a new tab)
ASRock's Steel Legend SL-1200G is a 1200W ATX 3.1 unit with a native 12V-2x6 cable, a 10-year warranty and a Cybenetics LAMBDA A noise rating.
Best for
- Buyers who want Cybenetics LAMBDA A noise certification.
Skip if
- Skip it if price comes first: the NZXT C1000 Gold Core cost less when we checked.
Why we like it
It uses 100% Japanese capacitors for longevity and stable output. Check your case and component specifications before buying. On rated output it ties with the be quiet! Pure Power 13 M 1200W at 1200W.
It matches the ASUS ROG Strix 1000W Platinum on warranty (10 years). It also comes with a 5V boost function for stable standby voltage. No depth is rated for the ASRock Steel Legend SL-1200G, so check the maker's page against your case's PSU bay.
On price it sat third of 5, between the cheaper be quiet! Pure Power 13 M 1000W and the pricier be quiet! Pure Power 13 M 1200W, at the time of writing. The maker doesn't give its 8-pin PCIe connector count; if that figure matters, the be quiet! Pure Power 13 M 1000W offers 4.
Key dimensions & specs
- Wattage: 1200W
- Native 12V-2x6 cables: 1
- Warranty: 10 years
- 80 Plus rating: Gold
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 135mm
- Colour: Black
Pros
- 1200W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- A 10-year warranty
- ATX 3.1 compliance
Cons
- Costs more than the NZXT C1000 Gold Core at the time of writing
Worth a Look4 of 5
be quiet! Pure Power 13 M 1200W on Amazon (opens in a new tab)
The be quiet!
Best for
- Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Skip if
- Its warranty is not published, which rules it out if you need that number.
Why we like it
Pure Power 13 M 1200W is built around four PCIe 6+2 connectors plus a native 12V-2x6, with semi-passive cooling at low load on top. On the spec sheet, it offers a 1200W rated output and offers a 1 native 12V-2x6 cable count. On rated output it ties with the ASRock Steel Legend SL-1200G at 1200W.
The be quiet! Pure Power 13 M 1200W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. It also has 4 PCIe 8-pin connectors for cards that use 8-pin power. No depth is rated for the be quiet! Pure Power 13 M 1200W, so check the maker's page against your case's PSU bay.
On price it sat fourth of 5, between the cheaper ASRock Steel Legend SL-1200G and the pricier ASUS ROG Strix 1000W Platinum, at the time of writing. The trade-off is native 12V-2x6 cable count; for more, the NZXT C1000 Gold Core offers 1.
Key dimensions & specs
- Wattage: 1200W
- 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
- 1200W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- 4 PCIe 8-pin connectors for older cards
- ATX 3.1 compliance
Cons
- No published warranty
- Costs more than the NZXT C1000 Gold Core at the time of writing
Premium Pick5 of 5
ASUS ROG Strix 1000W Platinum on Amazon (opens in a new tab)
ASUS's ROG Strix 1000W Platinum uses GaN MOSFETs and GPU-first voltage sensing on the graphics card rail.
Best for
- Spending more for the fullest feature set.
Skip if
- Skip it if rated output matters most to you; the ASRock Steel Legend SL-1200G offers 1200W.
Why we like it
It carries a Cybenetics LAMBDA A noise rating and a 10-year warranty. GaN MOSFETs raise efficiency, large ROG heatsinks cut temperatures and noise, and 0dB mode keeps it silent during light gaming. On rated output it ties with the NZXT C1000 Gold Core and the be quiet! Pure Power 13 M 1000W at 1000W.
It matches the ASRock Steel Legend SL-1200G on warranty (10 years). You get a platinum 80 plus rating here, which sets it apart from the be quiet! Pure Power 13 M 1200W and its a gold 80 plus rating. It was the highest-priced of the 5 picks at the time of writing, so the case for it rests on what it adds over the be quiet! Pure Power 13 M 1200W and the rest. The trade-off is rated output; for more, the ASRock Steel Legend SL-1200G offers 1200W.
Key dimensions & specs
- Wattage: 1000W
- Warranty: 10 years
- 80 Plus rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan stop: Yes
- Colour: Black
Pros
- 1000W of rated output for high-power cards
- A 10-year warranty
- 80 Plus Platinum efficiency
- ATX 3.1 compliance
Cons
- Rated output trails the ASRock Steel Legend SL-1200G (1200W)
- No published native 12V-2x6 cable count
- Costs more than the NZXT C1000 Gold Core at the time of writing
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.
- Standards
- We noted ATX version, 80 Plus and Cybenetics ratings.
- Wattage
- We compared rated output with NVIDIA's or AMD's recommended system power for the card.
- Price
- We grouped picks by price at the time of writing.
What to Look for in a PSUs for Heavy Workloads
Key buying criteria so you get the right fit the first time.
Decide on warranty first
Among these picks, warranty runs from 7 years on the NZXT C1000 Gold Core to 10 years on the ASRock Steel Legend SL-1200G. Match this to what you will actually do with it, then let price decide between the picks that qualify.
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.
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.
Check depth and cabling
Deeper units can clash with drive cages or front radiators. Fully modular cables make routing easier in tight cases.
How to Choose a PSUs for Heavy Workloads
By priority
| Priority | Consider | Why |
|---|---|---|
| Getting Cybenetics noise certification listed by NZXT for the least money | NZXT C1000 Gold Core | The cheapest way into this group, below the be quiet! Pure Power 13 M 1000W |
| Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6 | be quiet! Pure Power 13 M 1000W | Four PCIe 6+2 connectors plus a native 12V-2x6 |
| Buyers who want Cybenetics LAMBDA A noise certification | ASRock Steel Legend SL-1200G | A Cybenetics LAMBDA A noise certification |
| Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6 | be quiet! Pure Power 13 M 1200W | Four PCIe 6+2 connectors plus a native 12V-2x6 |
| Spending more for the fullest feature set | ASUS ROG Strix 1000W Platinum | The top of this price range, adding GaN MOSFETs |
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 |
|---|---|---|---|---|
| NZXT C1000 Gold Core | 1000W | 1 | Not listed | 7 years |
| be quiet! Pure Power 13 M 1000W | 1000W | 1 | 4 | Not listed |
| ASRock Steel Legend SL-1200G | 1200W | 1 | Not listed | 10 years |
| be quiet! Pure Power 13 M 1200W | 1200W | 1 | 4 | Not listed |
| ASUS ROG Strix 1000W Platinum | 1000W | Not listed | Not listed | 10 years |
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 $100 to $150 | NZXT C1000 Gold Core, be quiet! Pure Power 13 M 1000W, ASRock Steel Legend SL-1200G |
| About $150 to $250 | be quiet! Pure Power 13 M 1200W, ASUS ROG Strix 1000W Platinum |
Frequently Asked Questions
Which of these power supplies has the highest rated output?
The ASRock Steel Legend SL-1200G leads at 1200W, ahead of the be quiet! Pure Power 13 M 1200W at 1200W; the ASUS ROG Strix 1000W Platinum sits at the other end with 1000W.
What is the least I can spend on one of these power supplies?
That was the NZXT C1000 Gold Core at our last check; if you can stretch, the be quiet! Pure Power 13 M 1000W is the next step up and the ASUS ROG Strix 1000W Platinum the priciest.
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.
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.
Bottom Line
Our first pick is the NZXT C1000 Gold Core, chosen for the cheapest way into this group, below the be quiet! Pure Power 13 M 1000W. Look at the be quiet! Pure Power 13 M 1000W for four PCIe 6+2 connectors plus a native 12V-2x6, the ASRock Steel Legend SL-1200G for a Cybenetics LAMBDA A noise certification and the be quiet! Pure Power 13 M 1200W for four PCIe 6+2 connectors plus a native 12V-2x6 if those matter more to you.
Mount the PSU with its fan facing a filtered intake.