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Rectangular black ATX power supply with gold fan grille and modular cable sockets

Seasonic

Seasonic PRIME GX-1000 1000W 80 Plus Gold ATX power supply

SKU CH-S5Z4-M56C7 MPN PRIME GX-1000

Delivers 1000 W through a fully modular ATX design with 80 Plus Gold efficiency and a 135 mm fluid-dynamic-bearing fan featuring hybrid control

  • Max wattage1000 W
  • Power efficiency91.37% (Avg.)
  • Modular cablingFull Modular
  • Fan configuration135 mm Fluid Dynamic Bearing Fan w/ Hybrid Fan Control
  • Main power connector24Pin
  • 12V railsSingle

Model ATX Gold (1000W)

  • Stable voltage delivery with load regulation under 0.5 %
  • 80 Plus Gold certified at 91.37 % average efficiency
  • Full modular cabling reduces clutter and improves airflow
  • Hybrid fan control enables silent fanless operation at low load
  • 150000 hour MTBF at 25 °C indicates long-term reliability

High-wattage ATX power supply

The Seasonic PRIME GX-1000 delivers 1000 W of continuous power through a single +12 V rail rated at 83 A. It carries 80 PLUS Gold certification with an average efficiency of 91.37 %. A 135 mm fluid-dynamic-bearing fan runs under hybrid control that can stop completely at low load. The unit is fully modular and measures 170 mm in depth.

Suited for multi-GPU builds; not for compact cases

Eight 6+2-pin PCIe connectors support graphics configurations including RTX 30 and 40 Super series cards. Twelve SATA power headers handle large storage arrays. Micro-tolerance load regulation under .5 % and ripple below 20 mV suit overclocked CPUs and GPUs. The 170 mm length and ATX form factor rule out most small-form-factor chassis.

Verify case clearance and cable routing

Confirm the case accepts a 170 mm deep ATX supply and routes the 24-pin, EPS and modular cables without sharp bends. Ensure the mains supply provides 100-240 V at 50/60 Hz. The rear-mounted fan-control button lets you choose between S2FC and S3FC profiles after installation.

How it compares

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

Price $181.99
Pricier than about 59% of the 10,869 comparable items (median $142.99).
Max wattage 1000 W
Higher than about 70% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product linePRIME Ultra Gold
Model namePRIME GX-1000 (SSR-1000GD)
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors8 × 6+2-Pin
SATA power connectors12
Output type+3.3 V@25A, +5 V@25A, +12 V@83A, +5VSB@3A
Connection typesPCIe connecotors x 6,SATA x 14
Power
Max wattage1000 W
Power efficiency91.37% (Avg.)
Modular cablingFull Modular
Main power connector24Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current13–6.5 A
Size & build
Product dimensions3.39 in × 5.91 in × 6.69 in
Product weight9 lb (4.08 kg)
Shipping weight3.86 kg
Package size340 × 208 × 135 mm
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 configuration135 mm Fluid Dynamic Bearing Fan w/ Hybrid Fan Control
Mean time between failures150,000 h MTBF @ 25 degree C, excl. fan

Other versions of this model

5 more in the same range

Questions about this item

Do I need a case that accepts a 170 mm deep ATX power supply to install this unit?

Yes, the chassis must provide at least 170 mm of clear depth for the ATX form factor body.

Will my older motherboard with a 24-pin main connector and 4-pin CPU power plug work with this supply?

The 24-pin main connector fits directly; the 8-pin EPS cable splits into two 4-pin halves for legacy CPU sockets.

How can I confirm the hybrid fan control is active after building the system?

Press the rear S2FC/S3FC switch to S3FC; the 135 mm fan should stay off at low load and spin up only when temperature rises.

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