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Seasonic PRIME PX-1300 1300W 80+ Platinum fully modular ATX power supply
Seasonic

Seasonic Prime PX-1300

Expert rating8.8 / 10

Power SuppliesView on seasonic.com
Wattage:
1300 W
80 PLUS Rating:
Platinum
Modularity:
Fully Modular
ATX Standard:
ATX 3.0

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Manufacturer: Seasonic Last updated: 2026-09-12

Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier) Review

Seasonic Prime PX-1300 1300W 80 Plus Platinum fully modular power supply, ATX 3.0 certified, ATX form factor, native 12V-2x6/12VHPWR connector, 12-year warranty, Seasonic (in-house) platform.

The Seasonic Prime PX-1300 is a 1300W Platinum step below the Prime TX Titanium tier, sized for a single flagship GPU plus a high-core-count CPU with real overclocking headroom. Rated 1300W at 80 PLUS Platinum (Cybenetics Platinum efficiency / A++ noise), it's built on a Seasonic (in-house) platform with a 135mm fluid dynamic bearing fan running a zero-RPM semi-passive mode at idle. Fully Modular cabling and a 170mm chassis depth make it a realistic fit for a workstation or multi-GPU build with serious headroom, and it's backed by a 12-year warranty.

Efficiency, Noise, and Build Quality

The Prime PX-1300 carries an 80 PLUS Platinum certification and a Cybenetics Platinum efficiency / A++ noise rating, translating to consistently high real-world efficiency at typical 50% load and low fan noise thanks to its 135mm fluid dynamic bearing, Hybrid Silent fan control. It uses a Seasonic (in-house) platform with Japanese-made capacitors throughout for long-term reliability under sustained load.

Connectors and Cabling

Connector layout is 1x 24-pin ATX, 2x EPS 4+4, 1x 12V-2x6 (600W), 6x PCIe 6+2-pin, 10x SATA, 4x Molex. With 1 native 12V-2x6 connector(s) rated to deliver up to 600W to a single GPU, there's no need for a 4x8-pin-to-12VHPWR adapter on current-generation flagship cards. Cabling is fully modular, using standard flat or ribbon cables, with a single +12V rail design that simplifies load balancing across connectors.

Comparison to Alternatives

Against the Corsair RM1000x (Corsair's ATX 3.1-certified 1000W Gold benchmark), the Seasonic Prime PX-1300 matches its wattage class but differs on connector generation and OEM platform, making the choice mostly about brand ecosystem, warranty length (12 years here), and whether native 12V-2x6 connectors matter for your GPU. Compared with the Seasonic Prime 1000 Platinum (Seasonic's 1000W Platinum flagship), the Prime PX-1300 sits in the flagship extreme bracket at 1300W, so the decision usually comes down to matching wattage headroom to your actual GPU/CPU combo rather than one being categorically better.

Specifications

Identity

BrandSeasonic
Model NumberPrime PX-1300

Output and rails

Single +12V RailYes

Form factor and fit

Length170 mm
ColourBlack

Build quality

MTBF100000 hours

Cables

ModularityFully Modular

Monitoring, protection and price

ProtectionsOCP, OVP, OPP, SCP, OTP, UVP
Price299.99 USD
Warranty12 years
Wattage1300 W
80 PLUS RatingPlatinum
ATX StandardATX 3.0
Form FactorATX
Cybenetics EfficiencyPlatinum
Cybenetics NoiseA++
12V-2x6 Connectors1
Zero-RPM ModeYes
Sleeved CablesNo
PCIe 8-pin Connectors6
Connector Count1x 24-pin ATX, 2x EPS 4+4, 1x 12V-2x6 (600W), 6x PCIe 6+2-pin, 10x SATA, 4x Molex
Fan Size135 mm
Fan Model / Bearing135mm fluid dynamic bearing, Hybrid Silent fan control
OEM / PlatformSeasonic (in-house)
Japanese CapacitorsYes
Cable LengthsATX 610mm, EPS 650-750mm, PCIe 750-800mm, SATA 730-980mm

Expert Review

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8.8 / 10

A best-in-class 1300W Platinum-rated ATX unit for a workstation or multi-GPU build with serious headroom, held back only by its premium price.

Best for

  • Builders targeting a workstation or multi-GPU build with serious headroom
  • Anyone who wants fully modular cabling with native 12V-2x6 support
  • Systems where a 12-year warranty and Platinum-tier efficiency matter

Not for

  • Builds needing more than 1300W of continuous headroom
  • Buyers who need the smallest possible SFX/SFX-L footprint
  • Cost-sensitive builds better served by a lower-tier 80+ Bronze unit

FAQs

What are the key specifications of the Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier)?

The Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier) is a power supply from Seasonic. Key specs: Wattage 1300 W, 80 PLUS Rating Platinum, Cybenetics Efficiency Platinum, Cybenetics Noise A++, Modularity Fully Modular.

Will the Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier) work with my current setup?

The Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier) lists Wattage is 1300 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier) best suited to?

It suits builders targeting a workstation or multi-gpu build with serious headroom, anyone who wants fully modular cabling with native 12v-2x6 support, systems where a 12-year warranty and platinum-tier efficiency matter.

What are the drawbacks of the Seasonic Prime PX-1300 (1300W/80+ Platinum/ATX 3.0/Flagship Extreme Tier)?

It is a poor fit for builds needing more than 1300w of continuous headroom, buyers who need the smallest possible sfx/sfx-l footprint, cost-sensitive builds better served by a lower-tier 80+ bronze unit.

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