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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

  • TypeATX12V / EPS12V
  • Maximum Power1300 W
  • Fans1 x 135 mm Fluid Dynamic Bearing Fan
  • Main Connector20+4Pin
  • +12V RailsSingle
  • PCI-Express Connector8 x 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.

Highlights

  • 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

Specifications

BrandSeaSonic
SeriesPRIME Gold
ModelPRIME GX-1300 (SSR-1300GD)
TypeATX12V / EPS12V
Maximum Power1300 W
Fans1 x 135 mm Fluid Dynamic Bearing Fan
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector8 x 6+2-Pin
SATA Power Connector16
Max PSU Length170 mm
ModularFull Modular
Energy-Efficient80 PLUS GOLD Certified
Over Voltage ProtectionYes
ProtectionOPP, OVP, UVP, OCP, OTP, SCP
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current15 - 7.5 A
Output+3.3V@25A, +5V@25A, +12V@108A, [email protected] , +5VSB@3A
MTBF150,000 hours MTBF @ 25 degree C, excl. fan
ApprovalscTUVus, TUV, CB, CCC, BSMI, EAC, Energy Star, RoHS, WEEE, ErP Lot 6, REACH
Connectors1 x 20+4-Pin ATX Motherboard (610mm)
2 x 4+4-Pin EPS CPU (1 Connector each cable, 2 x 650mm Cable)
8 x 6+2-Pin PCIe (2 Connector each cable, 1 x 750mm Cable; 1 Connector each cable, 6 x 750mm Cable)
8 x SATA (4 Connector each cable, 2 x 810mm Cable)
4 x SATA (4 Connector each cable, 1 x 860mm Cable)
2 x SATA (2 Connector each cable, 1 x 450mm Cable)
2 x Molex to SATA 3.3 Adapter (2 Connector each cable, 1 x 300mm Cable)
3 x 4-Pin Peripheral / Molex (3 Connector each cable, 1 x 690mm Cable)
2 x 4-Pin Peripheral / Molex (2 Connector each cable, 1 x 470mm Cable)
Features80 PLUS Gold certified
Micro Tolerance Load Regulation (0.5 %)
Cable-free Connection Design
Premium Hybrid Fan Control - Fanless until 40 % load
Multi-GPU setup
Gold plated connectors
Dimensions3.39" x 5.91" x 6.69"

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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