Buying Guide
The Best 1500W and 1600W Power Supplies for Workstations and Multi-GPU PCs
Six very high-wattage units for AI workstations and multi-GPU builds, compared on cables, efficiency, fan design and size.
By The PC Journal editorial team
11 min read6 products evaluated
1500W and 1600W power supplies are for machines with two high-power graphics cards, AI and rendering workstations, or very heavy sustained loads. A single gaming GPU rarely needs this much.
This roundup is research-based: the specifications come from the manufacturers' listings, not a test bench. Prices at this level swing widely, so features carry more weight than cost in our ranking.
Check two things first: the combined power of your CPU and graphics cards, and your case's maximum PSU length. Some units here are 180mm long.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Best for Dual-GPU Workstations
Seasonic PRIME PX-1600 (ATX 3.1)
Two native 12V-2x6 cables with a Cybenetics Titanium rating.
Best for: AI or rendering workstations with two high-power graphics cards.
Our take Check price for Seasonic PRIME PX-1600 (ATX 3.1) (opens in a new tab)
Quietest Fan Design
Seasonic PRIME TX-1600 Noctua Edition
A Noctua NF-A12x25 fan with a custom curve and a LAMBDA A rating.
Best for: Workstations where noise matters as much as capacity.
Our take Check price for Seasonic PRIME TX-1600 Noctua Edition (opens in a new tab)
Best Fan Mode Control
be quiet! Dark Power Pro 14 IO 1600W
A switchable active or semi-passive fan mode with IO Center software.
Best for: Users who want to choose between silence and cooling headroom.
Our take Check price for be quiet! Dark Power Pro 14 IO 1600W (opens in a new tab)
Best for Corsair iCUE Systems
CORSAIR HX1500i (2025)
Monitoring and fan control through Corsair iCUE.
Best for: Builds already managed through Corsair iCUE.
Our take Check price for CORSAIR HX1500i (2025) (opens in a new tab)
Best Digital Platinum Unit
NZXT C1500 Platinum (ATX 3.1)
Digital power control and a 140mm magnetic-levitation fan.
Best for: Builders who want digital regulation without a Titanium price.
Our take Check price for NZXT C1500 Platinum (ATX 3.1) (opens in a new tab)
Best Budget Pick
ASRock Phantom Gaming PG-1600G
The lowest price in this group when we checked.
Best for: Budget builds that still need the core features.
Our take Check price for ASRock Phantom Gaming PG-1600G (opens in a new tab)
Our Picks
Best for Dual-GPU Workstations1 of 6
Seasonic PRIME PX-1600 (ATX 3.1) on Amazon (opens in a new tab)
The Seasonic PRIME PX-1600 is the pick for dual-GPU workstations, with two native 12V-2x6 cables and a Cybenetics Titanium rating.
Best for
- AI or rendering workstations with two high-power graphics cards.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
Seasonic positions it for AI workstations, with 100% Japanese capacitors and hybrid fan control. It costs less than the Noctua Edition while sharing Seasonic's PRIME platform. It has dual native 12V-2x6 connectors, carries 80 Plus Platinum and Cybenetics Titanium ratings, and is aimed at AI workstations.
It suits high-power workstations as well as gaming rigs. On efficiency tier it ties with the Seasonic PRIME TX-1600 Noctua Edition, the be quiet! Dark Power Pro 14 IO 1600W and the NZXT C1500 Platinum at Titanium. On fan size it ties with the ASRock Phantom Gaming PG-1600G at 135mm.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Platinum, Cybenetics Titanium
- Fan: 135mm fluid dynamic bearing, zero-RPM mode
- GPU cables: 2× 12V-2x6
Pros
- 80 Plus Platinum, Cybenetics Titanium efficiency
- Fan stops at low load
- Two native 12V-2x6 cables
- Fluid dynamic bearing fan
Cons
- No published warranty term
- No Cybenetics noise class
Quietest Fan Design2 of 6
Seasonic PRIME TX-1600 Noctua Edition on Amazon (opens in a new tab)
The Seasonic PRIME TX-1600 Noctua Edition is the quiet choice, using a Noctua NF-A12x25 fan with a custom fan curve and a LAMBDA A rating.
Best for
- Workstations where noise matters as much as capacity.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
It is 80 Plus Titanium and runs semi-passive at low load. It is also the most expensive unit here by a wide margin, so it suits workstations in shared rooms or studios. Its fan stays off up to 50% load, and the Noctua NF-A12x25 fan with a custom grill is about 8-10dB quieter than the regular model.
It is ATX 3.1 with a 12V-2x6 connector. On efficiency tier it ties with the Seasonic PRIME PX-1600, the be quiet! Dark Power Pro 14 IO 1600W and the NZXT C1500 Platinum at Titanium. It also offers Noctua-themed cabling. Buyers who need a confirmed fan size should compare it with the CORSAIR HX1500i, which comes in at 140mm.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Titanium
- Fan: zero-RPM mode
- GPU cables: 1× 12V-2x6
- Cabling: fully modular
Pros
- 80 Plus Titanium efficiency
- Fan stops at low load
- Native 12V-2x6 cable
- Cybenetics LAMBDA A noise rating
Cons
- No published warranty term
- Length not published
Best Fan Mode Control3 of 6
be quiet! Dark Power Pro 14 IO 1600W on Amazon (opens in a new tab)
The be quiet!
Best for
- Users who want to choose between silence and cooling headroom.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
Dark Power Pro 14 IO 1600W lets you choose between active and semi-passive cooling, and it is the first be quiet! unit with IO Center software control. It carries Titanium ratings from both 80 Plus and Cybenetics. The maker doesn't state a warranty term or cable counts, so confirm them if you run two cards.
It switches between multi-rail and single-rail modes, and it is Titanium rated at up to 94.9% efficiency. A vibration-free Silent Wings fan keeps it quiet. It matches the Seasonic PRIME PX-1600, the Seasonic PRIME TX-1600 Noctua Edition and the NZXT C1500 Platinum on efficiency tier (Titanium). There is no published fan size figure, whereas the CORSAIR HX1500i comes in at 140mm.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: Cybenetics Titanium
- Fan: zero-RPM mode
- GPU cables: 1× 12V-2x6
Pros
- Cybenetics Titanium efficiency
- Fan stops at low load
- Native 12V-2x6 cable
- Monitoring and control through be quiet!'s IO Center software
Cons
- No published warranty term
- No Cybenetics noise class
Best for Corsair iCUE Systems4 of 6
CORSAIR HX1500i (2025) on Amazon (opens in a new tab)
The Corsair HX1500i suits builds already managed in Corsair iCUE, which provides monitoring and fan control.
Best for
- Builds already managed through Corsair iCUE.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
It uses a 140mm FDB fan with zero-RPM mode. At 1500W it sits below the 1600W units, which is still ample for most single-GPU workstations. A 140mm fluid-dynamic-bearing fan keeps it quiet and long-lived, and it is ATX 3.1 certified for PCIe 5.1 graphics cards.
The cables are fully modular. Zero RPM mode stops the fan at low and medium loads, and iCUE software sets fan curves and OCP modes. It matches the NZXT C1500 Platinum on fan size (140mm). If you want a confirmed efficiency tier, look to the Seasonic PRIME PX-1600 instead: it offers Titanium, while this one gives no figure.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Fan: 140mm fluid dynamic bearing, zero-RPM mode
- Cabling: fully modular
Pros
- Fan stops at low load
- Fluid dynamic bearing fan
- Fully modular cables
- Monitoring and fan control through Corsair iCUE
Cons
- No published warranty term
- No published efficiency tier
Best Digital Platinum Unit5 of 6
NZXT C1500 Platinum (ATX 3.1) on Amazon (opens in a new tab)
The NZXT C1500 Platinum offers digital power control and a 140mm magnetic-levitation fan at a lower price than the Titanium units.
Best for
- Builders who want digital regulation without a Titanium price.
Skip if
- You want a clearly stated warranty term before buying.
Why we like it
It includes two 12V-2x6 cables and a Cybenetics Titanium rating, despite its Platinum 80 Plus badge. That makes it a strong value for a two-card build. A 140mm magnetic levitation fan keeps noise low, and digital control gives precise voltage regulation with low ripple.
It is ATX 3.1 and PCIe 5.1 compliant. Its magnetic levitation fan is built for a long lifespan. It matches the Seasonic PRIME PX-1600, the Seasonic PRIME TX-1600 Noctua Edition and the be quiet! Dark Power Pro 14 IO 1600W on efficiency tier (Titanium). It matches the CORSAIR HX1500i on fan size (140mm).
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Platinum, Cybenetics Titanium
- Fan: 140mm magnetic levitation bearing, zero-RPM mode
- GPU cables: 2× 12V-2x6
- Cabling: fully modular
Pros
- 80 Plus Platinum, Cybenetics Titanium efficiency
- Fan stops at low load
- Two native 12V-2x6 cables
- Magnetic levitation bearing fan
Cons
- No published warranty term
- No Cybenetics noise class
Best Budget Pick6 of 6
ASRock Phantom Gaming PG-1600G on Amazon (opens in a new tab)
The ASRock Phantom Gaming PG-1600G is the value option, with two 12V-2x6 cables, eight PCIe 6+2 connectors and a 10-year warranty.
Best for
- Budget builds that still need the core features.
Skip if
- You want a fan that stops at idle; none is rated for this unit.
Why we like it
It is 180mm long, which rules out many cases, and ASRock itself warns buyers to check clearance. If your case can take it, it costs far less than the other 1600W units. On efficiency tier it trails the group at Platinum, while the Seasonic PRIME PX-1600 offers Titanium.
On fan size it ties with the Seasonic PRIME PX-1600 at 135mm. It also comes with a 180mm length that needs a large case. GPU power comes from two native 12V-2x6 cables plus 8 PCIe 6+2 leads; match those against the sockets on your card. Compare its 180mm length with your case's maximum PSU length, leaving room for the modular plugs.
Key dimensions & specs
- Form factor: ATX, ATX 3.1
- Efficiency: 80 Plus Gold, Cybenetics Platinum
- Length: 180mm
- Fan: 135mm fluid dynamic bearing
- GPU cables: 2× 12V-2x6, 8× PCIe 6+2
- Cabling: fully modular
- Warranty: 10 years
Pros
- 80 Plus Gold, Cybenetics Platinum efficiency
- 10-year warranty
- Two native 12V-2x6 cables
- 8 PCIe 6+2 connectors
Cons
- 180mm long
- No zero-RPM mode
How We Chose
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.
- Warranty and build
- We recorded warranty terms and build details stated by each manufacturer.
What to Look for in a 1500W and 1600W Power Supplies
Key buying criteria so you get the right fit the first time.
Plan for length and cables at high wattage
High-wattage power supplies tend to be longer and heavier on cables. At 1500W and above, 170mm to 180mm is common.
Confirm your case can take the length with room for cables.
Platinum and Titanium in practice
Platinum and Titanium units waste less power as heat. That helps quiet operation and running costs for machines under heavy load for many hours.
For typical gaming use, efficiency is a secondary factor after fit and connectors.
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.
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.
Count connectors before watts
Your graphics card's spec page lists its power sockets: one 12V-2x6, two 8-pin or three 8-pin. A unit needs a matching cable for each socket, and extra wattage does not help if it has too few.
Check the exact card model rather than the GPU name, since partner cards with the same chip often use different sockets.
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.
How to Choose a 1500W and 1600W Power Supplies
By priority
| Priority | Consider | Why |
|---|---|---|
| AI or rendering workstations with two high-power graphics cards | Seasonic PRIME PX-1600 | Two native 12V-2x6 cables with a Cybenetics Titanium rating |
| Workstations where noise matters as much as capacity | Seasonic PRIME TX-1600 Noctua Edition | A Noctua NF-A12x25 fan with a custom curve and a LAMBDA A rating |
| Users who want to choose between silence and cooling headroom | be quiet! Dark Power Pro 14 IO 1600W | A switchable active or semi-passive fan mode with IO Center software |
| Builds already managed through Corsair iCUE | CORSAIR HX1500i | Monitoring and fan control through Corsair iCUE |
| Builders who want digital regulation without a Titanium price | NZXT C1500 Platinum | Digital power control and a 140mm magnetic-levitation fan |
| Budget builds that still need the core features | ASRock Phantom Gaming PG-1600G | The lowest price in this group when we checked |
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 |
|---|---|---|
| Seasonic PRIME PX-1600 | 2 | Not listed |
| Seasonic PRIME TX-1600 Noctua Edition | 1 | Not listed |
| be quiet! Dark Power Pro 14 IO 1600W | 1 | Not listed |
| CORSAIR HX1500i | Not listed | Not listed |
| NZXT C1500 Platinum | 2 | Not listed |
| ASRock Phantom Gaming PG-1600G | 2 | 8 |
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 $150 to $250 | ASRock Phantom Gaming PG-1600G |
| Over $250 | NZXT C1500 Platinum, CORSAIR HX1500i, be quiet! Dark Power Pro 14 IO 1600W, Seasonic PRIME PX-1600, Seasonic PRIME TX-1600 Noctua Edition |
Frequently Asked Questions
Why would I need two 12V-2x6 cables?
Mainly for two high-power graphics cards or workstation builds. Most single-GPU systems need one.
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.
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.
Is an ATX 3.0 power supply still fine?
Yes, if it has the connectors your card needs. ATX 3.1 adds the 12V-2x6 socket, which is the better choice for a new purchase.
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.
Bottom Line
The Seasonic PRIME PX-1600 is the pick for dual-GPU workstations, with two native 12V-2x6 cables and a Cybenetics Titanium rating. The Noctua Edition TX-1600 is the quiet choice, and the be quiet! Dark Power Pro 14 IO lets you choose between active and semi-passive cooling.
The Corsair HX1500i suits iCUE-managed systems, the NZXT C1500 offers digital control for less, and the ASRock PG-1600G is the value option if your case can take its 180mm length.