850W Single +12V Rail
Provides dependable power delivery for gaming PCs, performance systems, and modern component configurations.
850W
CORSAIR RMx Series RM850x 850W 80 Plus Gold Fully Modular ATX Power Supply (Black)
Sale price$129.99Regular price
$169.99
CP-9020270-NA
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CORSAIR RMx Series RM850x 850W 80 Plus Gold Fully Modular ATX Power Supply (Black)
Sale price$129.99Regular price
$169.99
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Product Details
CORSAIR RMx Series RM850x — 850W 80 Plus Gold Fully Modular ATX Power Supply
A premium black fully modular ATX power supply designed for quiet, dependable PC power with Cybenetics Gold efficiency, Intel ATX 3.1 compliance, PCIe 5.1 readiness, a native 12V-2x6 connector, 100% Japanese 105°C electrolytic capacitors, and low-noise cooling.
Reliable 850W power for modern gaming PCs and performance builds, featuring flexible modular cabling, Zero RPM fan mode, a 140mm FDB fan, and a 10-year warranty.
Executive Summary
Core Capabilities
Technical Specs
Quiet, Efficient 850W Power for Today’s Demanding PC Hardware
The CORSAIR RMx Series RM850x delivers dependable 850W power for modern gaming, creator, and workstation PC builds. Fully modular ultra-flexible embossed cables simplify installation by letting builders connect only the cables their system requires. Intel ATX 3.1 compliance and PCIe 5.1 support help prepare the PSU for current high-performance components, while the native 12V-2x6 connector provides a direct GPU-to-PSU connection for compatible graphics cards with no adapter required. Cybenetics Gold efficiency, 100% Japanese 105°C-rated electrolytic capacitors, a 140mm fluid dynamic bearing fan, Zero RPM fan mode, and a rear manual fan adjustment knob make the RM850x a refined power foundation for quiet, reliable builds.
850W Fully Modular Power
Connect only the cables your system needs for cleaner routing, improved airflow, and easier PC building.
Gold-Class Efficiency
Cybenetics Gold-rated efficiency delivers up to 91% efficiency for lower power consumption, less heat, and reduced noise.
Modern GPU Ready
ATX 3.1 compliance, PCIe 5.1 support, and a native 12V-2x6 cable support today’s demanding graphics cards.
850W
Power Output
Single +12V rail power delivery for gaming PCs, creator systems, and performance desktops.
91%
Efficiency Rating
Cybenetics Gold efficiency helps reduce waste heat, noise, and power consumption.
ATX 3.1
Power Standard
Built to Intel’s ATX 3.1 standard with support for transient power spike resistance.
10 Years
Warranty
Backed by a limited 10-year manufacturer warranty for long-term confidence.
Core Capabilities
Fully Modular Cabling for Clean Builds
The RM850x features fully modular cabling so you only connect the cables your system requires. Ultra-flexible embossed cables with low-profile cable combs make installation cleaner, simpler, and better suited for showcase PC builds.
Cybenetics Gold-Certified Efficiency
Rated for up to 91% efficiency, the RM850x helps lower power consumption, reduce heat output, and minimize noise while delivering dependable power for high-performance gaming and productivity PCs.
ATX 3.1 and PCIe 5.1 Hardware Support
Compliance with Intel’s ATX 3.1 power standard and PCIe 5.1 support helps the RM850x handle modern components and resist transient power spikes from demanding graphics cards and next-generation hardware.
Native 12V-2x6 GPU Connector
A native PCIe 12V-2x6 connector provides a direct connection from PSU to compatible graphics cards, ensuring a cleaner installation with no adapter necessary for supported GPUs.
Low-Noise 140mm Fluid Dynamic Bearing Fan
A 140mm FDB fan uses a specially calculated fan curve for quiet operation, while Zero RPM fan mode enables near-silent performance at lower loads. A rear fan speed adjustment knob allows quick manual control when desired.
Key Features
Fully Modular Cabling
Use only the cables your system needs for cleaner cable management and easier installation.
80 Plus Gold / Cybenetics Gold Efficiency
High-efficiency power delivery helps reduce heat, noise, and wasted energy.
Intel ATX12V Version 3.1
Modern ATX 3.1 design supports demanding PC hardware and transient power spike resistance.
Native PCIe 12V-2x6 Cable
Direct GPU-to-PSU connection for compatible latest-generation graphics cards without an adapter.
Zero RPM Fan Mode
Fan remains off at lower loads for near-silent operation during light system use.
Manual Override Fan Knob
Rear fan speed adjustment knob gives users quick manual control when additional airflow is desired.
100% Japanese 105°C Capacitors
High-quality electrolytic capacitors deliver steady, reliable power and dependable electrical performance.
Premium Build Quality for Quiet Long-Term Reliability
The RM850x is designed for dependable operation across demanding builds, with a 50°C maximum operating temperature rating, air cooling, a single 140mm fluid dynamic bearing fan, and no lighting for a clean, stealthy black aesthetic. With fully modular embossed cables, eight SATA connectors, three PCIe 6+2-pin connectors, a 12+4-pin PCIe connector, two EPS12V connectors, and a 10-year warranty, it is ready to power multiple builds over years of use.
140mm
FDB Fan
Large fluid dynamic bearing fan delivers low-noise cooling performance.
8× SATA
Storage Power
Plenty of SATA connectors for SSDs, hard drives, hubs, and accessories.
3× PCIe
6+2-Pin Cables
Supports PCIe expansion cards and compatible GPU power requirements.
50°C
Max Operating Temp
Built for reliable power delivery under high-stress conditions.
Technical Specifications
Key Specs
BrandCORSAIR
Product NameCORSAIR RMx Series RM850x 850W 80 Plus Gold Fully Modular ATX Power Supply
Model NumberCP-9020270-NA
ColorBlack
UPC840006667506
Wattage850W
Power & Efficiency
Modular DesignFully Modular
Energy EfficiencyCybenetics Gold / 80 Plus Gold Efficiency
ATX StandardIntel ATX12V Version 3.1
PCI Express VersionPCI Express 5.0 / PCIe 5.1 Support
Power Cord IncludedYes
Cord Length5 ft
Maximum Operating Temperature50°C
Connectors & Cabling
ATX Connector24-Pin ATX Motherboard Cable
EPS12V Connector2 × EPS / ATX12V 8-Pin (4+4)
PCIe Connector3 × PCIe 8-Pin (6+2), 1 × PCIe 12+4-Pin / 12V-2x6
SATA Connector8 × SATA Connectors
Peripheral Connector3
Floppy ConnectorFalse
Cable StyleEmbossed Ultra-Flexible Modular Cables with Low-Profile Combs
Form Factor, Cooling & Features
Form FactorATX
Cooling SystemAir
Cooling Fan Type140mm Fluid Dynamic Bearing Fan
Number of Fans Included1
Zero RPM Fan ModeYes
Manual Fan ControlRear Fan Speed Adjustment Knob
Capacitors100% Japanese 105°C-Rated Electrolytic Capacitors
Lighting TypeNone
Dimensions & Warranty
Product Height160 mm
Product Width86 mm
Product Length150 mm
Product Weight62.4 oz
Warranty - Parts10 Years
Warranty - Labor10 Years
Package Contents & Warranty
CORSAIR RMx Series RM850x — 850W 80 Plus Gold Fully Modular ATX Power Supply
Model: CP-9020270-NA • UPC: 840006667506 • Color: Black
CORSAIR RM850x Power Supply
850W fully modular ATX power supply with Gold efficiency and low-noise cooling.
24-Pin ATX Motherboard Cable
Primary motherboard power cable for standard ATX system builds.
2 × EPS / ATX12V 8-Pin (4+4) Cables
CPU power cables for compatible motherboards and high-performance systems.
PCIe 12V-2x6-Pin (12+4) Cable
Native GPU power cable for compatible latest-generation graphics cards.
3 × PCIe 8-Pin (6+2) Cables
PCIe power cables for compatible graphics cards and expansion hardware.
2 × SATA Cables
Supports up to 8 SATA power connections for drives and accessories.
PATA 4-Pin Cable
Peripheral power cable for compatible legacy or accessory devices.
Power Cable
Included AC power cable for connecting the PSU to wall power.
Limited 10-Year Manufacturer Warranty
10-year parts and labor warranty for long-term peace of mind.
A Gold-Standard Fully Modular PSU for Quiet, Reliable Modern PC Builds
CORSAIR RMx Series RM850x combines 850W power delivery, Cybenetics Gold and 80 Plus Gold efficiency, fully modular embossed cabling, Intel ATX 3.1 compliance, PCIe 5.1 support, a native 12V-2x6 GPU connector, 100% Japanese 105°C capacitors, a low-noise 140mm fluid dynamic bearing fan, Zero RPM fan mode, and manual fan speed control in a clean black ATX design. It is an excellent power supply for gaming PCs, creator desktops, performance workstations, and long-term upgrade-ready builds.
850W Gold Efficiency Fully Modular ATX 3.1 PCIe 5.1 • 12V-2x6 10-Year Warranty
UPC: 840006667506 • Limited 10-Year Parts & Labor Warranty. A quiet, efficient, and future-ready modular PSU built for clean installation, stable power, and premium PC performance.
Included in the Box