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CORSAIR

CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

Model: CP-9020270-NA
SKU: 6587623
Sold byBest Buy
Deal ends Jun 29, 2026
$169.99
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Wattage

850 watts
Availability
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Key Accessories:

  • Intel - Core Ultra 9 285K 24-Cores 24-Threads - 4.6GHz (5.7 GHz Turbo) Socket LGA 1851 Unlocked Desktop Processor - Multi
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    The price was $619.99

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New and Refurbished
$127.00 - $209.28
Specifications
  • Wattage
    850 watts
    Modular
    Fully modular
    Energy Efficiency
    Cybenetics Gold
    ATX Connector
    ATX CABLE 24-PIN (24). 2x EPS/ATX12V CABLE 8-PIN (4+4)
    PCIe Connector
    3x PCIe 8-PIN (6+2). 1x PCIe 12+4-PIN(12+4)
    Peripheral Connector
    3
  • Key Specs
    • Wattage: 850 watts (Measurement of electrical power.)
    • Modular: Fully modular
    • Energy Efficiency: Cybenetics Gold (Computer and server power supplies with the 80 PLUS certification are tested for operating efficiency at 10, 20, 50, and 100% of rated load. If a product tests at least 80% efficient, it qualifies for the base level 80 PLUS certification. Bronze, Silver, Gold, Platinum, and Titanium level certifications are given to products with even higher efficiency ratings.)
    • ATX Connector: ATX CABLE 24-PIN (24). 2x EPS/ATX12V CABLE 8-PIN (4+4) (The configuration of the connector as it connects a computer power supply unit to an ATX motherboard.)
    • PCIe Connector: 3x PCIe 8-PIN (6+2). 1x PCIe 12+4-PIN(12+4) (The configuration of the connector as it connects a computer power supply unit to a PCIe (Peripheral Component Interconnect Express) motherboard interface.)
    • Peripheral Connector: 3 (The configuration of the connector as it connects a computer power supply unit to a peripheral component such as a motherboard, video card, lighting, etc.)
    • SATA Connector: 8x SATA Connectors (The configuration of the connector as it connects a computer power supply unit to a SATA-based drive.)
    • EPS12V Connector: 2 (The configuration of the connector as it connects a computer power supply unit to a EPS12V motherboard interface.)
    • PCI Express Version: PCI Express 5.0
    • Form Factor: ATX (The size, arrangement, and physical configuration of the product.)
    • Product Length: 150 millimeters (The out of box length of the item. Length is measured as the longest dimension of the item.)
  • General
    • Brand: CORSAIR
    • Model Number: CP-9020270-NA
    • Product Name: RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply
    • Color: Black
  • Power
    • Wattage: 850 watts (Measurement of electrical power.)
    • Modular: Fully modular
    • Energy Efficiency: Cybenetics Gold (Computer and server power supplies with the 80 PLUS certification are tested for operating efficiency at 10, 20, 50, and 100% of rated load. If a product tests at least 80% efficient, it qualifies for the base level 80 PLUS certification. Bronze, Silver, Gold, Platinum, and Titanium level certifications are given to products with even higher efficiency ratings.)
    • Power Cord Included: true (Connects your product to an electrical outlet, allowing for immediate use (provided that other installation requirements are met).)
    • Cord Length: 5 feet
  • Connectivity
    • ATX Connector: ATX CABLE 24-PIN (24). 2x EPS/ATX12V CABLE 8-PIN (4+4) (The configuration of the connector as it connects a computer power supply unit to an ATX motherboard.)
    • Floppy Connector: FALSE (The configuration of the connector as it connects a computer power supply unit to a floppy disk drive.)
    • PCIe Connector: 3x PCIe 8-PIN (6+2). 1x PCIe 12+4-PIN(12+4) (The configuration of the connector as it connects a computer power supply unit to a PCIe (Peripheral Component Interconnect Express) motherboard interface.)
    • Peripheral Connector: 3 (The configuration of the connector as it connects a computer power supply unit to a peripheral component such as a motherboard, video card, lighting, etc.)
    • SATA Connector: 8x SATA Connectors (The configuration of the connector as it connects a computer power supply unit to a SATA-based drive.)
    • EPS12V Connector: 2 (The configuration of the connector as it connects a computer power supply unit to a EPS12V motherboard interface.)
    • PCI Express Version: PCI Express 5.0
    • Form Factor: ATX (The size, arrangement, and physical configuration of the product.)
  • Dimensions
    • Product Height: 160 millimeters (The out of box height of the item. Height is measured as the vertical distance from the bottom of the item to the top as it would be primarily used or placed.)
    • Product Width: 86 millimeters (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
    • Product Length: 150 millimeters (The out of box length of the item. Length is measured as the longest dimension of the item.)
    • Product Weight: 62.4 ounces (The out of box weight of the item.)
  • Cooling
    • Cooling System: Air (A computer's CPU generates heat while operating and requires a cooling system to keep internal components functioning properly. Air cooling uses fans to draw in cool air and exhaust hot air, while liquid cooling uses coolant-filled tubes and water blocks to regulate internal temperature more efficiently.)
    • Cooling Fan Type: 140mm Fluid Dynamic Bearing Fan
    • Number of Fans Included: 1
  • Features
    • Lighting Type: None
  • Warranty
    • Warranty - Parts: 10 years
    • Warranty - Labor: 10 years
  • Other
    • UPC: 840006667506

CORSAIR RMx Series Fully Modular Low-Noise Power Supplies deliver quiet, dependable power with Cybenetics Gold efficiency to your PC. Fully modular, ultra-flexible embossed cables make PC builds easy, as you connect only the cables your system requires. Compliant with the ATX 3.1 power standard from Intel, RMx PSUs have the connections needed to power today’s demanding PC hardware including a native 12V-2x6 connector. 100% Japanese 105°C-rated electrolytic capacitors deliver fantastic electrical performance, while a 140mm FDB fan provides low noise cooling. Backed by a ten-year warranty, RMx PSUs are the gold standard for many years to come.

  • Fully Modular: Reliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system needs.
  • Cybenetics Gold-Certified: Rated for up to 91% efficiency, resulting in lower power consumption, less noise, and cooler temperatures.
  • ATX 3.1 Compliant: Compliant with the ATX 3.1 power standard from Intel, supporting PCIe 5.1 and resisting transient power spikes.
  • Native 12V-2x6 Connector: Ensures compatibility with the latest graphics cards with a direct GPU to PSU connection – no adapter necessary.
  • Embossed Cables with Low-Profile Combs: Sleek, ultra-flexible embossed cables look great and make installing and connecting the RMx a breeze.
  • Low Noise with 140mm Fan: A 140mm FDB fan with a specially calculated fan curve ensures low-noise operation even at full load, with a fan speed adjustment knob on the back for quick manual control.
  • 100% Japanese Electrolytic Capacitors: Delivers steady, reliable power and dependable electrical performance with 105°C-rated Japanese capacitors.
  • 50°C Maximum Operating Temperature: For reliable power even under high-stress conditions.
  • Zero RPM Fan Mode: For near-silent operation at lower loads.
  • Ten-Year Warranty: Your guarantee of reliable operation for peace of mind through multiple builds.
Whats Included
  • RM850x Power Supply
  • 1x ATX CABLE 24-PIN (24)
  • 2x EPS/ATX12V CABLE 8-PIN (4+4)
  • 3x PCIe CABLE 8-PIN (6+2)
  • 1x PCIe CABLE 12+4-PIN(12+4)
  • 2x SATA CABLE (4 SATA - (Straight angle))
  • 1x PATA CABLE (4-PIN)
  • Power Cord
  • Mounting screws
  • Cable ties

Q: Is the power supply compatible with the ATX 3.1 power standard?

A: The RMx PSUs are compliant with the ATX 3.1 power standard from Intel.

Q: What is the warranty period for the power supply?

A: The RMx power supply comes with a ten-year warranty.

Q: How many PCIe connectors does the power supply have?

A: This power supply has three 8-pin PCIe connectors and one 12+4-pin PCIe connector.

Q: What type of cooling fan is used in the power supply?

A: The Corsair RM850x power supply uses a 140mm fluid dynamic bearing fan for cooling.

Q: Does the power supply come with a power cord?

A: This power supply includes a power cord.

Q: Will this power supply work with a RTX 5080? Are any additional cables needed?

A: Yes, it will, all cables attached

Q: what is best buys return policy on this item

A: undefined

Q: When I'm placing this in my pc case, should I place the fan side up or face it down? Which way will make it intake and exhaust?

A: Face it down the exhaust is in the bottom

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CORSAIR RMe Series Fully Modular Low-Noise Power Supplies provide quiet, reliable power with Cybenetics Gold efficiency to your PC. The modular cables make PC builds easy, as you connect only the cables your system requires. With ATX 3.1 and PCIe 5.1 compliance with inclusion of native 12V-2x6 connnector and cable, and an array of PCIe 8-pin power connectors, RMe PSUs have the connections needed to power today’s demanding PC hardware. Industrial-grade, 105°C-rated capacitors deliver superb electrical performance, backed by a seven-year warranty. With a 140mm-long casing that works with nearly any modern case, the CORSAIR RMe Series is steady power for your system.

Pros for CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black
Overall Performance, Noise Level, Cable Management, Installation Ease, Power Supply CapacityOverall Performance, Power Capacity, Noise Level, Installation EaseOverall Performance, Power Capacity, Noise Level, Installation Ease, Fan ControlOverall Performance, Noise Level, Cable Management, Installation Ease, Power Capacity
Cons for CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black
There were no cons for this product—There were no cons for this product—Coil WhineThere were no cons for this product—

Specs

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Reviews

Rating 4.8 out of 5 stars with 373 reviews

5 star rating. 341 reviews4 star rating. 13 reviews3 star rating. 5 reviews2 star rating. 7 reviews1 star rating. 7 reviews
95% would recommend to a friend
Customers are sayingCustomers are delighted by the RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply's overall performance, noting that their computers run perfectly. They appreciate its quiet operation, even when the system is under heavy use, and find the cable management to be very easy. Additionally, customers find the installation to be easy and like the adjustable fan.
This summary was generated by AI based on customer reviews.
  • Overall Performance (112)
  • Noise Level (62)
  • Cable Management (54)
  • Power Supply Capacity (28)
  • Installation Ease (24)

Customer Images

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

  • Rated 5 out of 5 stars

    Modular and Easy!

    Overall this product is good because of its modularity. The wattage is good for my needs and because its modular its easy to keep cables tidy and organized. One thing I am not a fan of is the power port orientation. I wished it was different because I struggled to use ishift on my case. I was able to figure it out but I'm just afraid of the tension on the cable.

    Posted by AlejandroE

  • Rated 5 out of 5 stars

    Solid PSU – Great purchasing

    Picked this up for a new PC build and it's been running great. The installation was straightforward, and the fully modular cables definitely made things a lot cleaner inside the case. Everything powered on the first try, and it's been stable without any issue. Running a Core i7 & PNY 5060 without breaking a sweat. Also really quiet – honestly can’t hear it at all most of the time. It seems well-built and came nicely packaged too. No complaints so far. Hopefully it holds up long-term, but first impressions are all positive. Would buy again.

    Posted by Squall

  • Rated 5 out of 5 stars

    Quiet and efficient

    Going from an old non-modular to this unit significantly increased my efficiency and it cut noise way down too. The new cables are pretty and tidy, the fan is quiet when it does run, and coil whine is practically zero.

    Posted by EmmanuelM

See all customer reviews
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