Seasonic TX-1000 PSU pictured.

Seasonic TX-1000

The best 1000W PSU right now.

(Image: © Future)

Our Verdict

Seasonic maintains its top spot with its excellent PSU platform, and with a stellar 12-year warranty you can be sure this PSU is built to last.


  • High performance and silent operation
  • High-quality components and top build quality
  • Fully modular
  • 12-year warranty


  • High OCP on all rails, especially the minor ones

PC Gamer's got your back Our experienced team dedicates many hours to every review, to really get to the heart of what matters most to you. Find out more about how we evaluate games and hardware.

The Seasonic TX-1000 has top-notch build quality. Besides great soldering work, it also uses Japanese caps everywhere, including many polymer caps besides electrolytic ones and a fluid dynamic bearing fan. Seasonic engineers did their best to offer sky-high efficiency under all load regions and silent operation, at the same time, along with increased reliability. 

Performance-wise, this PSU belongs to the top league since it achieves tight load regulation on all rails, it has terrific ripple suppression without using the annoying in-line caps, and its hold-up time is sky-high. On top of that, the 5VSB rail's efficiency is high, and at light loads, the PSU achieves some of the highest efficiency readings we have seen.

So if you're looking for the best PSU for gaming at 1000W, this is it.


Swipe to scroll horizontally
Manufacturer (OEM)Seasonic
Max. DC Output1000W
Efficiency80 PLUS Titanium, Cybenetics Titanium
NoiseCybenetics A+ (15-20 dB[A])
ModularYes (fully)
Intel C6/C7 Power State SupportYes
Operating Temperature (Continuous Full Load)0 - 50°C
ProtectionsOVP, UVP, OPP, OCP, OTP, SCP, surge
No Load OperationNo
Cooling135mm Fluid Dynamic Bearing Fan
Semi-Passive OperationYes
Dimensions (W x H x D)150 x 85 x 175mm
Weight2.1kg (4.63lb)
Form FactorATX12V v2.4, EPS 2.92
Warranty12 Years

Seasonic hit the jackpot with its Prime platform, starting from Gold efficiency and going up to Titanium. Several high-impact brands have already included this platform into their portinos, including Asus (Rog Thor 1200W), Corsair (AX line), and Antec in its legendary Signature line. 

If Seasonic could make more of these units, more brands would likely get in line to get them, despite their high prices. But the majority of buyers prefer low-efficiency and more affordable power supplies, unfortunately. Still, when an OEM is confident enough to provide a platform with a twelve-year warranty, you know that this a bullet-proof product.

Speaking of which, the build quality is top, and Seasonic used the best parts available to make this platform. Japanese manufacturers provide all caps and the cooling fan uses a fluid dynamic bearing. Hong Hua, the maker of the fan, has proved so far to be a reliable manufacturer, and this is why it is popular in high-end PSUs.

Swipe to scroll horizontally
Max. Power (amps)252510030.3
Max. Power (watts)125125996153.6

The single 12V rail can deliver almost the unit’s full power alone, while the minor rails can go up to 125W, combined.

Swipe to scroll horizontally
CableAmount includedIn-cable caps
ATX Connector 20+4 pin1No
4+4 pin EPS12V2No
6+2 pin PCIe6No
4-pin Molex (or adapter)3No
AC Power Cord1N/A

A significant asset of the TX-1000 is that it has six PCIe connectors on dedicated cables. You won't have a problem powering energy-hungry graphics cards where the use of a single cable with two PCIe connectors should be avoided. The only thing missing now is a 12+4 PCIe connector, which will be added in the future revisions of this platform.


The Seasonic Prime Titanium 1000 is the performance king in this wattage category.

Load regulation is tight on all rails and ripple suppression is good. The hold-up time is over 20ms, the power ok signal is accurate, and its hold-up time exceeds 16ms. The inrush current is at average to low levels.

Efficiency is sky-high in all load ranges, though we expected higher efficiency in the 5VSB rail, to be on par with the rest circuits on the PSU. Yet only the SilverStone Titanium unit manages to take the lead in this regard, and thankfully the TX-1000's vampire power is low. The transient response is also good on all rails.

The OCP triggering point at 12V is correctly set, but it is too high on the other rails, especially at 5VSB, where ripple goes out of control when this rail is overloaded. The OPP is also high, but the platform can take the load. Nonetheless, it is not wise to overload your PSU for prolonged periods. You should get a stronger PSU if the current one cannot meet your power requirements.

Importantly, the TX-1000 is one of the quietest PSUs available in the market. The high-efficiency levels help in that.

Final thoughts

Seasonic TX-1000 PSU pictured.

(Image credit: Future)

Seasonic’s Prime platform still keeps the performance crown several years after its development. Given the new requirements of the ATX 3.0 specification, Seasonic will have to tune it and include 12+4 pin connectors, to make it compatible with the upcoming GPU generations. But thanks to its high performance and good transient response, this won’t be a magnificent headache, but it will require time and money, of course, since no change in a product is easy. 

The TX-1000 easily copes with the competition and its sibling, the Corsair AX1000, was its main competitor but since the latter is pulled from the market, the TX-1000 remains alone at the top of the charts. If there were an alternative to this worth buying it would be the Super Flower Leadex Titanium 1000. But with the twelve-year warranty that Seasonic provides, there is no doubt that this platform is reliable, and its future buyers will have a long peace of mind.

The Verdict
Seasonic TX-1000

Seasonic maintains its top spot with its excellent PSU platform, and with a stellar 12-year warranty you can be sure this PSU is built to last.