Seasonic
Seasonic PRIME PX-850 850W 80 PLUS Platinum power supply
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
- ATX 80+ Platinum (850W) Black
- ATX 80+ Platinum (500W) Black Fanless
- ATX 80+ Platinum (1600W) Black
- ATX 80+ Platinum (1300W) 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.
Highlights
- 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
Specifications
| Brand | SeaSonic |
|---|---|
| Series | PRIME Ultra Platinum |
| Model | PRIME PX-850 (SSR-850PD) |
| Type | ATX12V |
| Maximum Power | 850 W |
| Fans | 1 x 135 mm Fluid Dynamic Bearing Fan |
| Main Connector | 20+4Pin |
| +12V Rails | Single |
| PCI-Express Connector | 6 x 6+2-Pin |
| SATA Power Connector | 10 |
| Max PSU Length | 170 mm |
| Modular | Full Modular |
| Energy-Efficient | 80 PLUS PLATINUM Certified |
| Over Voltage Protection | Yes |
| Input Voltage | 100 - 240 V |
| Input Frequency Range | 50/60 Hz |
| Input Current | 11 - 5.5 A |
| Output | +3.3V@20A, +5V@20A, +12V@70A, [email protected] , [email protected] |
| MTBF | 150,000 hours MTBF @ 25 degree C, excl. fan |
| Approvals | cTUVus, TUV, CB, CCC, BSMI, EAC, CE, Energy Star, RoHS, WEEE, ErP Lot 6, REACH |
| Connectors | 1 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 |
| Features | Ultra-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 |
| Dimensions | 3.39" x 5.91" x 6.69" |
| Shipping weight | 3.61 kg |
| Package size | 343 × 206 × 140 mm |
Other versions of this model
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In stockQuestions about this item
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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