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Rectangular ATX power supply, matte black finish, modular cable sockets, 135 mm fan grille

Seasonic

Seasonic PRIME PX-850 850W 80 PLUS Platinum power supply

SKU CH-QK6Z-24QW3 MPN PRIME PX-850

Full-modular 850 W ATX unit with 80 PLUS Platinum efficiency, a 135 mm fluid-dynamic fan offering fanless operation, and micro-tolerance load regulation under 0.5 %

  • TypeATX12V
  • Maximum Power850 W
  • Fans1 x 135 mm Fluid Dynamic Bearing Fan
  • Main Connector20+4Pin
  • +12V RailsSingle
  • PCI-Express Connector6 x 6+2-Pin

Options ATX 80+ Platinum (850W) Black

  • 80 PLUS Platinum certification wastes less energy during conversion
  • Fully modular cabling lets you use only the cables you need
  • Premium hybrid fan control offers silent fanless operation
  • Micro tolerance load regulation under .5% delivers stable power
  • 150000 hours MTBF at 25°C indicates long-term reliability

850 W ATX power supply for high-performance builds

This fully modular ATX12V unit delivers 850 W of continuous power with 80 PLUS Platinum efficiency. A single +12 V rail rated at 70 A supplies clean current to demanding components. Load regulation stays under 0.5 % for stable voltage under heavy loads.

Ideal for multi-GPU systems needing six PCIe

Six 6+2-pin PCIe cables and ten SATA power connectors support multiple graphics cards and storage arrays. The 170 mm length fits most mid-tower and larger cases. Builds requiring only a few drives or a single GPU can use a smaller, less expensive unit.

Fanless mode via premium hybrid fan control

A 135 mm fluid dynamic bearing fan stops completely at low load when S3FC mode is selected. The rear switch toggles between fanless and constant cooling profiles without software. Silence-focused builders gain true zero-fan operation; noise-tolerant users may prefer a simpler design.

Pluspunten

  • 80 PLUS Platinum certification wastes less energy during conversion
  • Fully modular cabling lets you use only the cables you need
  • Premium hybrid fan control offers silent fanless operation
  • Micro tolerance load regulation under .5% delivers stable power
  • 150000 hours MTBF at 25°C indicates long-term reliability

Specificaties

BrandSeaSonic
SeriesPRIME Ultra Platinum
ModelPRIME PX-850 (SSR-850PD)
TypeATX12V
Maximum Power850 W
Fans1 x 135 mm Fluid Dynamic Bearing Fan
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector6 x 6+2-Pin
SATA Power Connector10
Max PSU Length170 mm
ModularFull Modular
Energy-Efficient80 PLUS PLATINUM Certified
Over Voltage ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current11 - 5.5 A
Output+3.3V@20A, +5V@20A, +12V@70A, [email protected] , [email protected]
MTBF150,000 hours MTBF @ 25 degree C, excl. fan
ApprovalscTUVus, TUV, CB, CCC, BSMI, EAC, CE, Energy Star, RoHS, WEEE, ErP Lot 6, REACH
Connectors1 x Main Power (24/20 pins)
2 x CPU (8/4 pins)
6 x PCIe (8/6 pins)
10 x SATA
5 x Peripheral
1 x Floppy
FeaturesUltra-High Efficiency, 80 PLUS Platinum Certified
Micro Tolerance Load Regulation
Top-Quality 135 mm Fluid Dynamic Bearing Fan
Premium Hybrid Fan Control
Cable-free Connection Design
Fully Modular Cabling Design
Multi-GPU Technologies Supported
Gold-Plated High Current Terminals
Dimensions3.39" x 5.91" x 6.69"
Verzendgewicht3.61 kg
Pakketafmetingen343 × 206 × 140 mm

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How do I install the PRIME PX-850 and what step is often missed?

Mount the 170 mm ATX unit, connect the 20+4 pin main cable plus the two CPU 8/4 pin cables, then plug only the modular leads you need; the step people skip is pressing the fan-control button to choose S2FC or S3FC before first power-on.

What maintenance or replacement will the PRIME PX-850 need later?

The 135 mm fluid-dynamic-bearing fan is the only moving part; after many years it can be swapped for another 135 mm unit, while the rest of the supply is rated for 150000 hours MTBF at 25 °C excluding the fan.

What limit appears first under sustained heavy load on the PRIME PX-850?

The single +12 V rail delivers up to 70 A; if the combined GPU and CPU draw exceeds that current the over-current protection will trip before the 850 W total rating is reached.

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