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Corsair

CORSAIR RM850e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2x6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black

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Style: RMe (2025) ATX 3.1, PCIe 5.1


Size: 850 Watts


Color: Black


Features

  • Fully Modular PSU: Reliable and efficient, low-noise power supply with fully modular cabling, so you only have to connect the cables your system build needs.
  • Intel ATX 3.1 Certified: Compliant with the ATX 3.1 power standard, supporting PCIe 5.1 platform withstands 2x transient power excursions from the GPU.
  • Keeps Quiet: A 120mm rifle bearing fan with a specially calculated fan curve keeps fan noise down, even when operating at full load.
  • 105C-Rated Capacitors: Delivers steady, reliable power and dependable electrical performance.
  • Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.

Description

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. Box Contents 1x 24-pin ATX (24-pin) Connector Cable 2x 8-pin ATX 12V/EPS12V (4+4-pin) Connector Cables 1x 8-pin PCIe (6+2-pin) Connector Cable 1x 600W 12V-2x6 (12+4-pin) Connector Cable 1x 12V-2x6 (12+4-pin) to dual 8-pin PCIe (6+2-pin) Cable 6x SATA Connectors 2x PATA Connectors

Model Name: CORSAIR RM850e


Brand: Corsair


Compatible Devices: Monitor


Connector Type: ATX


Output Wattage: 850 watts


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Item dimensions L x W x H: 5.91 x 5.51 x 3.35 inches


Item Weight: 3.4 pounds


Compatible Devices: Monitor


Connector Type Used on Cable: ATX


Output Wattage: 850 watts


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Power Supply Design: Full Modular


Number of Fans: 1


Maximum Input Voltage: 240 volts_of_alternating_current


Minimum Input Voltage: 100 volts_of_alternating_current


System Bus Connector Type: 24 Pin, 8 Pin (4+4 Pin)


Item Dimensions: 5.91 x 5.51 x 3.35 inches


Item Weight: 3.4 pounds


Model Name: CORSAIR RM850e


Brand: Corsair


Manufacturer: Corsair


UPC: 840006691242


Model Number: CP-9020296-NA


Mfr Part Number: CP-9020296-NA


Warranty Description: 7 Years Manufacturer


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Handles My i9-12900KS + RTX 3090 Rig Without Breaking a Sweat
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
I’ve been building PCs for over a decade, and this is easily one of the most impressive power supplies I’ve used to date. I picked up the CORSAIR RM850e (2025 revision) as part of a rebuild centered around an Intel i9-12900KS and RTX 3090, and I’ve been nothing but impressed so far. Build Quality & Design: The unit itself is solid — heavy in a reassuring way, with a clean black finish and no unnecessary branding or flashy extras. The fully modular design is a huge plus, especially for managing cables in a tight mid-tower. I appreciated that the included cables were all black and flat — easy to route behind the motherboard tray, and they look clean without custom sleeving. Installation & Cabling: Installation was simple, and everything fit snugly. I’m using the standard 3x 8-pin for the 3090, but it’s nice knowing the 12V-2x6 cable is included in case I upgrade to a future PCIe 5.1 card later on. No loose connectors, no weird bends required — and unlike some modular PSUs I’ve dealt with, the ports on the unit are clearly labeled and firmly seated. Performance & Stability: Despite powering a very power-hungry setup, this PSU hasn’t flinched once. The 12900KS, even under boost/load, can be a voltage-hungry CPU, especially paired with the 3090 — but even during max load stress testing (Cinebench + Heaven benchmark running together), rails stayed completely stable, no crashes or brownouts, and no sign of power-related instability. Noise & Efficiency: Corsair nailed the noise levels. During idle and light gaming, the fan doesn't even spin up. Even when it does under load, it’s so quiet it fades into the background of my other case fans. My case has good airflow, but the fan curve on this PSU is genuinely impressive. It’s also Cybenetics Gold rated, and the system draws power very efficiently — I've been monitoring wattage via a smart plug, and it lines up well with published benchmarks for power efficiency. Extras & Future-Proofing: ATX 3.1 & PCIe 5.1 ready 105°C-rated Japanese capacitors (a must for long-term reliability) Modern Standby support works perfectly — fast wake times, zero sleep issues in Windows 11 Final Thoughts: For anyone running a high-end system like mine — especially with power-hungry components like the i9-12900KS and RTX 3090 — this PSU offers peace of mind. No coil whine, no overheating, no second-guessing whether it’s enough. It’s quiet, efficient, and built with headroom for future GPUs thanks to the included 12V-2x6 cable and compliance with the latest standards. Highly recommend if you’re building or upgrading a performance-focused rig and want something that’ll last. ... show more
Reviewed in the United States on June 27, 2025 by S.b
    • 850e Power Supply
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
Fully modular design — clean build, fewer cables, and tidy cable routing 80 Plus Gold / Cybenetics Gold efficiency — meaning lower heat and power waste Semi-silent 120 mm rifle-bearing fan with zero‑RPM mode under low loads — great balance of cool and quiet Compact ATX 3.1 form factor (~140 mm deep) — fits snugly in most mid-tower cases Solid protection suite + 7–10 year warranty — backing Corsair’s reliability claims The RM850e is a powerful, efficient, and very capable PSU, ideal for modern builds with high-power components. ... show more
Reviewed in the United States on June 24, 2025 by Austin P.
    • High Quality and Compact
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
Review Image by Diego
Review Image by Diego
Review Image by Diego
High build quality, and the small size makes cable management easy in bigger and smaller cases. The included cables are very nice, and are aesthetically pleasing as oppose to most PSU's. Also very quiet on idle I can't even hear when it turns on under load.
Reviewed in the United States on July 7, 2026 by Diego
    • Good PSU!
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
I haven't run into some of the issues others have for this power supply, but I'm also not an expert user. It works, it's quiet, and the build quality seemed ok to me. It fit in my case easily enough, screws all went in without issues, and the cables feel very nice. It came with screws and some zip ties which were helpful! ... show more
Reviewed in the United States on January 6, 2026 by Customer Review
    • Quiet, Efficient, and Future-Ready
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
Review Image by dj
Review Image by dj
The CORSAIR RM850e (2025) is everything I wanted in a high-performance PSU. It’s compact, fully modular, and the fan rarely kicks on, and when it does, it's whisper-quiet, exceeded my expectations Installation was smooth, cable management was clean, and the build quality is top-tier It also comes with plenty of cables, if you're looking for performance, silence, and reliability, this PSU delivers grate value ... show more
Reviewed in the United States on August 17, 2025 by dj
    • Clean cables and easy to manage
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
great power supply. Love the cables. I used Fractal North case and the cabling was easy and clean..
Reviewed in the United States on June 30, 2026 by DailyGuy
    • Never had an issue with Corsair
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
I recently built a new computer and decided that my old Corsair RM850X needed to be retired. I chose the PSU because, for me, Corsair has always been a rock solid choice. They are priced competitively and I have never had an issue with power rails or delivery. I used custom cables so the color of the PSU itself wasn't really an issue. The cable length would have been long enough had I used them and they seemed to be high quality material. It's currently powering an AMD ryzen 9 9900x and a 7900xtx with no issues. I have 7 140mm fans, a 420mm aio and lots of RGB and it doesn't skip a beat. It may make me a Corsair fanboy but I will continue using their products until they give me a reason not to. ... show more
Reviewed in the United States on November 3, 2025 by Larry Rodriguez
    • If you need it, its reliable and simple to install
Style: RMe (2025) ATX 3.1, PCIe 5.1 Size: 850 Watts Color: Black
Works great, swapped out my old psu for those when upgrading PC parts because of bottlenecking, monitors randomly flickering on my old psu.
Reviewed in the United States on May 5, 2026 by Paul

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