Corsair RM850x 850W ATX 3.1 Fully Modular Power Supply

The Corsair RM850x is an 850W fully modular ATX 3.1 power supply from Corsair's premium RM x-series range. Designed for enthusiast builds that demand both performance and longevity, it features a 140mm FDB fan, a physical fan speed adjustment knob, ultra-flexible embossed cables, and a 10-year manufacturer warranty — setting it apart from the standard RMe series.

UK-based seller
Tracked delivery across the UK
Genuine product sourced through established UK suppliers and distribution partners

• Wattage: 850W
• Form Factor: ATX 3.1 / PCIe 5.1
• Efficiency: Cybenetics Gold certified (up to 91% at 230Vac)
• Modularity: Fully modular with ultra-flexible embossed cables
• Fan: 1 x 140mm FDB fan with Zero RPM mode and manual speed knob
• +12V Rail: Single rail, 70.8A
• Native 12V-2x6 connector: Supports latest-generation GPUs without adapters
• Capacitors: 100% Japanese 105°C-rated electrolytic
• Max. Operating Temperature: 50°C
• Warranty: 10 years
• Colour: Black

The RM850x sits above the RMe series, offering a longer 160mm chassis with a larger 140mm FDB fan for quieter, more efficient cooling. The fan speed adjustment knob gives direct control over noise and airflow, and the premium cable kit uses ultra-flexible embossed cables with low-profile combs for cleaner builds. A 10-year warranty reflects Corsair's confidence in the unit's long-term reliability.

Cable Compatibility Note: This unit is designed for use with genuine Corsair Type 5 cable sets only. Do not use cables from other Corsair PSU generations, as they are not compatible.

Delivery & Fulfilment
This product is sold by TechFinder UK, a UK-based sole trader business. All hardware is sourced through established UK suppliers and distribution partners. Customers can typically expect to receive their order within 3–5 business days from the date the order is placed, with free tracked delivery across the United Kingdom.

Why Buy from TechFinder UK?

• UK-based sole trader — genuine products, real accountability
• Sourced through established distribution partners
• Secure checkout
• Free tracked UK delivery — typically 3–5 business days from the date the order is placed
• Pre- and post-purchase support available

Technical Specifications

• Form Factor: ATX 3.1
• Wattage: 850W
• Efficiency Certification: Cybenetics Gold (up to 91% at 230Vac)
• +12V Rail: Single rail — 70.8A
• Modularity: Fully modular
• Fan: 1 x 140mm FDB fan with manual speed knob
• Zero RPM Mode: Yes
• PFC: Active
• AC Input: 100–240VAC
• Max. Operating Temperature: 50°C
• Motherboard Connector: 1 x 24-pin ATX
• CPU Connectors: 2 x 8-pin (4+4) EPS/ATX12V
• PCIe Connectors: 1 x 12+4-pin 12V-2x6 (600W); 3 x 8-pin (6+2) PCIe
• SATA Connectors: 8 x SATA
• Peripheral Connectors: 3 x PATA (Molex)
• Dimensions: 150 x 86 x 160mm (W x H x D)
• Colour: Black
• Warranty: 10 Years Corsair Manufacturer Warranty

Package Contents

• Corsair RM850x Power Supply
• DC Cable Kit
• UK Power Cord
• Mounting Screws
• Cable Ties

Product Identification
Model: RM850x
MPN: CP-9020270-UK
UPC: 840006667544