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 Alex Morgan, PC Hardware Editor
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
Which of the 5 picks to look at first. Tap a name for the full analysis.
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.
Check price for NZXT C1000 Gold Core (ATX 3.1) on Amazon (opens in a new tab)
Also Consider
be quiet! Pure Power 13 M 1000WFour PCIe 6+2 connectors plus a native 12V-2x6.
Best for: Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Check price for be quiet! Pure Power 13 M 1000W on Amazon (opens in a new tab)
Strong Alternative
ASRock Steel Legend SL-1200GA Cybenetics LAMBDA A noise certification.
Best for: Buyers who want Cybenetics LAMBDA A noise certification.
Check price for ASRock Steel Legend SL-1200G on Amazon (opens in a new tab)Worth a Look
be quiet! Pure Power 13 M 1200WFour PCIe 6+2 connectors plus a native 12V-2x6.
Best for: Buyers who want four PCIe 6+2 connectors plus a native 12V-2x6.
Check price for be quiet! Pure Power 13 M 1200W on Amazon (opens in a new tab)
Premium Pick
ASUS ROG Strix 1000W PlatinumThe top of this price range, adding GaN MOSFETs.
Best for: Spending more than the be quiet! Pure Power 13 M 1200W costs for the fullest feature set in this group.
Check price for ASUS ROG Strix 1000W Platinum on Amazon (opens in a new tab)
| Pick | Why it stands out | Best for | Check 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) on Amazon (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 on Amazon (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 on Amazon (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 on Amazon (opens in a new tab) |
| The top of this price range, adding GaN MOSFETs. | Spending more than the be quiet! Pure Power 13 M 1200W costs for the fullest feature set in this group. | Check price for ASUS ROG Strix 1000W Platinum on Amazon (opens in a new tab) |
Our Picks
Lowest Price Here1 of 5
NZXT C1000 Gold Core (ATX 3.1)
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.
Key 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)
The catch
There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 13 M 1000W offers 4.
Also Consider2 of 5
be quiet! Pure Power 13 M 1000W
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. Another plus: ATX 3.1 compliance.
Before buying, weigh one limit: no published warranty. It was priced above the NZXT C1000 Gold Core and below the ASRock Steel Legend SL-1200G at the time of writing.
Key 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
The catch
There is no published warranty figure, whereas the ASRock Steel Legend SL-1200G offers 10 years.
Strong Alternative3 of 5
ASRock Steel Legend SL-1200G
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.
Key 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
The catch
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.
Worth a Look4 of 5
be quiet! Pure Power 13 M 1200W
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.
Key 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
The catch
The trade-off is native 12V-2x6 cable count; for more, the NZXT C1000 Gold Core offers 1.
Premium Pick5 of 5
ASUS ROG Strix 1000W Platinum
ASUS's ROG Strix 1000W Platinum uses GaN MOSFETs and GPU-first voltage sensing on the graphics card rail.
Best for
- Spending more than the be quiet! Pure Power 13 M 1200W costs for the fullest feature set in this group.
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. The ASUS ROG Strix 1000W Platinum has no stated native 12V-2x6 cable; confirm the cable kit before pairing it with a 16-pin card. 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.
Key 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
The catch
The trade-off is rated output; for more, the ASRock Steel Legend SL-1200G offers 1200W.
How We Chose
Alex Morgan compared the manufacturer specifications, connectivity, warranty terms and compatibility of every pick. Figures come from the makers unless a third-party source is named; we did not test these products ourselves.
- How these picks were ranked
- We set side by side five power supplies on rated output, native 12V-2x6 cable count, 8-pin PCIe connector count and warranty as the makers state them. Nothing was tested in-house; 5 of the 12 fields compared are stated for every pick, while native 12V-2x6 cable count and 8-pin PCIe connector count have gaps.
- The shared baseline
- All 5, from the NZXT C1000 Gold Core to the ASUS ROG Strix 1000W Platinum, state rated output, 80 Plus rating and ATX version and share ATX 3.1 ATX version and Black colour.
- Where the specs have gaps
- The ASUS ROG Strix 1000W Platinum gives no native 12V-2x6 cable count; the NZXT C1000 Gold Core, the ASRock Steel Legend SL-1200G and the ASUS ROG Strix 1000W Platinum give no 8-pin PCIe connector count.
- Price range
- At our last check the picks ran from the NZXT C1000 Gold Core ($100 to $150) to the ASUS ROG Strix 1000W Platinum ($150 to $250).
What to Look for in a PSUs for Heavy Workloads
Key buying criteria so you get the right fit the first time.
Rated output across these picks
Here rated output runs from 1000W on the ASUS ROG Strix 1000W Platinum to 1200W on the ASRock Steel Legend SL-1200G, a 20% spread. Start with the ASRock Steel Legend SL-1200G if rated output decides it.
Warranty
The ASRock Steel Legend SL-1200G tops warranty at 10 years and the NZXT C1000 Gold Core sits lowest at 7 years; 2 picks share the top figure. The ASRock Steel Legend SL-1200G is the pick for warranty. The be quiet! Pure Power 13 M 1000W and the be quiet! Pure Power 13 M 1200W give no warranty figure, so 3 of 5 picks are compared here.
Modular cable sockets on the back of a power supply What to check at home
The NZXT C1000 Gold Core comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. The ASUS ROG Strix 1000W Platinum has no stated native 12V-2x6 cable; confirm the cable kit before pairing it with a 16-pin card.
Features beyond the spec table
The be quiet! Pure Power 13 M 1000W: semi-passive cooling at low load. The ASRock Steel Legend SL-1200G: a 5V boost function for stable standby voltage. The ASUS ROG Strix 1000W Platinum: GPU-first voltage sensing for the graphics card rail.
Power cables routed to a graphics card inside a PC Budget
$100 to $150 buys the NZXT C1000 Gold Core, the be quiet! Pure Power 13 M 1000W and the ASRock Steel Legend SL-1200G; $150 to $250 buys the be quiet! Pure Power 13 M 1200W and the ASUS ROG Strix 1000W Platinum at our last check.
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 than the be quiet! Pure Power 13 M 1200W costs for the fullest feature set in this group | 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
The ASRock Steel Legend SL-1200G leads on rated output at 1200W, ahead of the be quiet! Pure Power 13 M 1200W at 1200W. "Not listed" marks native 12V-2x6 cable count where the ASUS ROG Strix 1000W Platinum leaves the figure out.
| 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
At our last check the cheapest pick, the NZXT C1000 Gold Core, sat in the $100 to $150 tier, 2 tiers in all up to the ASUS ROG Strix 1000W Platinum at $150 to $250; Amazon prices move, so recheck before buying.
| 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
Is the ASUS ROG Strix 1000W Platinum worth paying more than the NZXT C1000 Gold Core?
The spec sheets show warranty (10 years against 7 years) in its favour. The NZXT C1000 Gold Core sat in the $100 to $150 tier and the ASUS ROG Strix 1000W Platinum in the $150 to $250 tier when we checked, with 3 other picks between them; pay the difference only if warranty decides your purchase.
What makes the NZXT C1000 Gold Core the Lowest Price Here?
The label rests on the cheapest way into this group, below the be quiet! Pure Power 13 M 1000W. It suits getting Cybenetics noise certification listed by NZXT for the least money.
Do the NZXT C1000 Gold Core and the ASUS ROG Strix 1000W Platinum differ on 80 Plus rating?
The NZXT C1000 Gold Core, the be quiet! Pure Power 13 M 1000W, the ASRock Steel Legend SL-1200G and the be quiet! Pure Power 13 M 1200W use Gold; the ASUS ROG Strix 1000W Platinum uses platinum.
What should I check before buying the be quiet! Pure Power 13 M 1000W?
The be quiet! Pure Power 13 M 1000W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. 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. In this guide it ranks second of 5, and fourth of 5 on rated output (1000W).
Beyond the specs, what sets the NZXT C1000 Gold Core and the be quiet! Pure Power 13 M 1000W apart?
The NZXT C1000 Gold Core: Cybenetics noise certification listed by NZXT. The be quiet! Pure Power 13 M 1000W: four PCIe 6+2 connectors plus a native 12V-2x6. The ASRock Steel Legend SL-1200G: a Cybenetics LAMBDA A noise certification.
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.
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About the author
PC Hardware Editor
Alex covers PC hardware, monitors, components, upgrades and peripherals for The PC Journal, with a focus on helping readers understand specifications, compatibility and meaningful product trade-offs.
Covers: Monitors, Graphics cards, Processors, PC components, Peripherals, Upgrades and compatibility
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