✅ RM850x Power Supply
✅ Modular DC Cable Kit
✅ Power Cord
✅ Mounting Screws
✅ Cable Ties
✅ User Manual
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The CORSAIR RM850x 850W 80 Plus Gold Fully Modular ATX Power Supply - Black (CP-9020270-NA) supplies the power for the most demanding workstations and gaming PCs. Exceptional electrical performance and 80 PLUS Gold efficiency are provided by this next-generation PSU, keeping your system energy-efficient, silent and cool. Designed for enthusiasts, it has a 140mm magnetic levitation fan, high-quality 100% Japanese 105°C capacitors and a completely modular design with low-profile wires. With its next-generation 12V-2x6 (PCIe 5.0) connector, the RM850x is ready for both ATX 3.1 and PCIe 5.0, providing clean, dependable power for high-end systems, new GPUs and CPUs.
• 850W Continuous Output handles top-tier CPUs and multi-GPU configurations with room for future upgrades.
• 80 PLUS Gold Certified delivers over 87%-90% efficiency, reducing energy loss, heat and utility bills.
• Fully Modular Cables connect only what you need for a clean, tidy and optimized case airflow.
• ATX 3.1 & PCIe 5.0 Ready that native 12V-2x6 cable supports the latest graphics cards, future-proofing your system.
• 100% Japanese 105°C Capacitors ensures maximum reliability and stable power delivery, even at high temperatures.
• 140mm Magnetic Levitation Fan runs ultra-quiet, with smart Zero RPM mode at low and medium loads for silent operation.
• Robust Protections that includes OVP, UVP, OPP, SCP, OTP and inrush/surge protection for your valuable components.
• Compact 160mm Length fits most ATX cases, making cable management simple and installation hassle-free.
• Multi-GPU Ready that multiple EPS and PCIe connectors power up modern gaming rigs and creative workstations.
• Confidence and reliability that last through many PC builds and upgrades.
🗹 Whisper-quiet operation that advanced cooling and smart fan controls ensure a silent system even under heavy load, perfect for home or office.
🗹 Ultimate compatibility & future-proofing that native PCIe 5.0 connectors and ATX 3.1 support ensure smooth upgrades with the latest components.
🗹 Rock-solid reliability with premium Japanese capacitors and robust protections safeguard every investment in high-performance hardware.
🗹 Simplified, clean builds that fully modular cables and a compact design make cable routing fast, neat and flexible for any custom case setup.
🗹 Energy savings that 80 PLUS Gold efficiency means less wasted power, lower costs and reduced environmental impact for green builders.
🗹 Zero hassle and enjoy up to a decade of worry-free operation and expert support from Corsair.
| Manufacturer | Cisco |
| Manufacturer Part Number | CP-9020270-NA |
| Product Name | CORSAIR RM850x 850W 80 Plus Gold Fully Modular ATX Power Supply - Black |
| Product Type | Switch |
Specification Compliance | ATX12V 3.1/ EPS12V |
PSU Form Factor | ATX |
Localization | North America |
Input Voltage | AC 100-240 V |
Frequency Required | 47 - 63 Hz |
Power Output Connectors Details | 1 x power 24 pin ATX ¦ 2 x power 8 pin EPS12V with detachable 4 pin ATX12V section ¦ 3 x 8 pin PCI Express power with detachable 2 pin section ¦ 8 x 15 pin Serial ATA power ¦ 3 x 4 pin internal power ¦ 1 x 16 pin PCI Express power |
Output Voltage | +3.3, ±5, +12 V |
Power Capacity | 850 Watt |
Output Current | +3.3V - 20 A ¦ +5V - 20 A ¦ +12V - 70.8 A ¦ +5VSB - 3 A |
Modular Cable Management | Yes |
Cybenetics Certification | Cybenetics Gold |
Cables Included | AC power cable ¦ Power 24 pin ATX with detachable 4 pin section modular cable 2 ft ¦ 2 x power 8 pin EPS12V modular cable 2.5 ft ¦ 3 x 8 pin PCI Express power with detachable 2 pin section 2 ft ¦ 16-pin 12VHPWR power modular cable 2 ft ¦ 2 x 15 pin Serial ATA power modular cable 2.8 ft ¦ 4 pin power modular cable 2.5 ft |
MTBF | 100,000 hours |
Cooling System | 140 mm fan |
Features | Zero RPM fan mode, manual fan speed control, fully modular, Cybenetics A, Modern Standby compatible |
Compliant Standards | UKCA, RoHS |
Width | 5.9 in |
Depth | 6.3 in |
Height | 3.4 in |
Yes, it includes multiple PCIe 8-pin connectors compatible with high-end GPUs like the RTX 4080 and 4090.
This model supports PCIe 4.0; for native ATX 3.0 support, consider the RM850x SHIFT or newer models.
It uses a 135mm Magnetic Levitation (MagLev) fan for quiet, long-lasting cooling.
Yes, its compact 160mm form factor fits comfortably in most ATX mid and full tower cases.
No, Zero RPM mode keeps the fan off at lower loads for silent operation.
It includes six 8-pin (6+2) PCIe connectors for graphics cards.
Over-voltage, under-voltage, short-circuit, over-power and over-temperature protection are all included.
The RM850x comes with flexible flat black modular cables for easy cable management.
Absolutely. Its stable power delivery and high capacity make it suitable for CPU and GPU overclocking.
Yes, it works with all current and upcoming AMD and Intel motherboard standards.
Even under heavy load, the MagLev fan remains whisper-quiet thanks to its dynamic control system.
Yes, a standard AC power cable is included in the box.
It includes multiple EPS connectors, which are compatible with dual CPU workstation motherboards.
Yes, orientation is flexible based on your case design and airflow setup.
Yes, CORSAIR includes a branded pouch to store unused modular cables.
It features a durable, matte black steel housing with high-quality finishes.
This model does not include digital monitoring; for that feature, look at CORSAIR's iCUE-enabled PSUs.
Yes, it’s an ideal upgrade for systems needing more headroom for future GPU or CPU upgrades.
It carries 80+ Gold, CE, CB, TÜV and other global safety certifications.
Yes, its robust design and high peak power handling make it well-suited for modern GPUs with transient spikes.
