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Rectangular ATX power supply unit with matte black finish and gold modular connectors visible on one side

Seasonic

Seasonic PRIME GX-1300 1300W 80+ Gold Full Modular power supply

SKU CH-H2XS-MK951

A 1300 W ATX power supply with 80 PLUS Gold efficiency, full modular cabling and a 135 mm fluid dynamic bearing fan that stays off until 40 % load

  • Max wattage1300 W
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm Fluid Dynamic Bearing Fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors8 × 6+2-Pin
  • 1300 W single +12 V rail delivers stable power to demanding builds
  • 80 PLUS Gold certified efficiency reduces waste heat and running cost
  • Full modular cabling keeps the case tidy and airflow clear
  • 135 mm fluid dynamic bearing fan stays off until 40 % load for silent operation
  • 150000 hour MTBF at 25 °C signals long-term reliability

1300 W full-modular ATX power supply

The Seasonic PRIME GX-1300 delivers 1300 W of continuous power through a single +12 V rail rated at 108 A. It uses the ATX12V/EPS12V form factor and meets 80 PLUS Gold efficiency requirements. All cables detach completely for a clean build.

Suited to multi-GPU workstations

Eight 6+2-pin PCIe connectors and sixteen SATA power connectors support dense multi-GPU configurations and large storage arrays. The 170 mm depth fits most full-tower and many mid-tower cases. Systems needing only modest wattage or a smaller footprint should consider lower-capacity units.

Single +12 V rail rated at 108 A

This rail supplies the bulk of power to modern graphics cards and CPUs, so its 108 A limit is the decisive figure when matching the PSU to a build. The unit also carries a 150 000-hour MTBF rating at 25 °C, excluding the 135 mm fluid-dynamic-bearing fan.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $177.99
Pricier than about 58% of the 10,869 comparable items (median $142.99).
Max wattage 1300 W
Higher than about 91% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product linePRIME Gold
Model namePRIME GX-1300 (SSR-1300GD)
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors8 × 6+2-Pin
SATA power connectors16
Output type+3.3 V@25A, +5 V@25A, +12 V@108A, +5VSB@3A
Connection types1 × 20+4-Pin ATX Motherboard (610 mm)
2 × 4+4-Pin EPS CPU (1 Connector each cable, 2 × 650 mm Cable)
8 × 6+2-Pin PCIe (2 Connector each cable, 1 × 750 mm Cable; 1 Connector each cable, 6 × 750 mm Cable)
8 x SATA (4 Connector each cable, 2 × 810 mm Cable)
4 x SATA (4 Connector each cable, 1 × 860 mm Cable)
2 x SATA (2 Connector each cable, 1 × 450 mm Cable)
2 x Molex to SATA 3.3 Adapter (2 Connector each cable, 1 × 300 mm Cable)
3 × 4-Pin Peripheral / Molex (3 Connector each cable, 1 × 690 mm Cable)
2 × 4-Pin Peripheral / Molex (2 Connector each cable, 1 × 470 mm Cable)
Power
Max wattage1300 W
Modular cablingFull Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Built-in protectionOPP, OVP, UVP, OCP, OTP, SCP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current15–7.5 A
Size & build
Product dimensions3.39 in × 5.91 in × 6.69 in
Compatibility
PSU length limit170 mm
Environment & compliance
Regulatory approvalscTUVus, TUV, CB, CCC, BSMI, EAC, Energy Star, RoHS, WEEE, ErP Lot 6, REACH
More details
Fan configuration1 × 135 mm Fluid Dynamic Bearing Fan
Mean time between failures150,000 h MTBF @ 25 degree C, excl. fan

Questions about this item

What does the 1300 W rating mean for a system with multiple high-end graphics cards?

The single +12 V rail can deliver up to 108 A, providing stable power for multi-GPU configurations under heavy load.

How does the 80 PLUS Gold certification affect real-world power draw?

It confirms the unit meets Gold efficiency targets at 20 %, 50 % and 100 % load, so less electricity is wasted as heat.

Will the 170 mm length fit in a standard ATX mid-tower case?

At 170 mm deep it matches the typical ATX power supply envelope, but verify your case's maximum PSU length clearance before installing.

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