Corsair RM850, RM Series, 80 Plus Gold Certified, 850 W Fully Modular ATX Power Supply - Black

Status: Corsair RM850: Unavailable on Amazon as of 2026-10-03 10:23 UTC. SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.

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Bottom line: The Corsair RM850: 80 PLUS Gold certified for lower draw, less heat, and quieter operation; main trade-off: 850 W ceiling leaves thin headroom for dual high-TDP GPUs despite SLI Ready.

Unavailable on Amazon as of 2026-10-03 10:23 UTC

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Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives:

Similar: RAIDMAX Cobra ATX 3.1 Power Supply 850W — $69.99 on Amazon as of 2026-10-06 22:19 UTC (price may vary).

View Current Price — $69.99

Similar: GIGABYTE 850W PSU - 80 Plus Gold Certified… — $89.99 on Amazon as of 2026-10-06 16:25 UTC (price may vary).

View Current Price — $89.99

Similar: Redragon RGMS-850W PRO 80+ Gold 850 Watt Power… — $65.99 on Amazon as of 2026-10-06 10:30 UTC (price may vary).

View Current Price — $65.99

Original listing (currently unavailable) → Compare to similar power supplies

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-03

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. About the author →

Pros & Cons

Pros

✓ 80 PLUS Gold certified for lower draw, less heat, and quieter operation
✓ Zero RPM mode shuts the fan off entirely at low and medium loads
✓ 135 mm rifle bearing fan on a tuned curve stays quiet even at full load
✓ 105C-rated industrial-grade capacitors, backed by a ten-year warranty
✓ Fully modular cables cut clutter and simplify later GPU or drive upgrades

Cons

✗ 850 W ceiling leaves thin headroom for dual high-TDP GPUs despite SLI Ready
✗ Zero RPM mode means no airflow at idle, so case ventilation matters more
✗ Fully modular design requires tracking spare cables between builds
✗ ATX form factor is too large for SFX or small-form-factor cases

Manufacturer description

The Corsair RM850 is an 850 W fully modular ATX power supply built around 80 PLUS Gold efficiency, which keeps power draw, heat, and fan noise lower than a comparable bronze-rated unit under the same load. Corsair pairs that efficiency with a 135 mm rifle bearing fan on a tuned curve, plus Zero RPM mode that shuts the fan off entirely at low and medium loads, so the RM850 stays effectively silent while you browse, work, or play lighter titles. Inside, 105 degree Celsius-rated industrial-grade capacitors handle the sustained electrical stress of long gaming sessions and multi-GPU SLI Ready…

SpecPicks Verdict

SpecPicks scored Corsair RM850 using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Compare with similarly-priced alternatives in the power supplies category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Is 850W enough for an RTX 4080 or similar high-end GPU?

850 W covers a single high-end GPU paired with a mainstream CPU in most builds. Add up your components' rated draw and compare against the 850 W output; for dual-GPU or heavily overclocked systems, check the GPU maker's recommended PSU wattage first.

How loud is the Corsair RM850 under load?

Zero RPM Fan Mode switches the 135 mm rifle bearing fan off completely at low and medium loads for near-silent running. Under heavier load the fan spins on a specially calculated curve that Corsair tunes to keep noise minimal even at full load.

What warranty comes with the Corsair RM850?

Corsair lists a ten-year warranty on RM Series power supplies. Confirm current coverage and registration terms on the product listing before you buy, since warranty terms can vary by region and seller.

Is the RM850 fully modular or semi-modular?

It is fully modular. Every cable detaches, so you connect only what your system needs. That keeps unused cables out of the case and makes adding a GPU or extra drives later much easier.

Key Features

80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise and cooler temperatures
Tuned for Low Noise Operation: A 135 mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load
105 degree Celsius-Rated Capacitors: Industrial-grade capacitors deliver solid electrical performance and reliability
Microsoft Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency
Zero RPM Fan Mode: At low and medium loads the cooling fan switches off entirely for near-silent operation

Full Specifications

Brand	Corsair
Color	Black
Wattage	850 watts
Fan Size	13.5 centimeters
Model Name	RM Series
Form Factor	ATX
Model Number	CP-9020196-UK
Connector Type	ATX
Cooling Method	Air
Item Type Name	CORSAIR RM Series RM850 80 PLUS Gold Fully Modular ATX Power Supply
Number of Fans	1
Output Wattage	850
Item Dimensions	11.89 x 8.43 x 5.08 inches
Mfr Part Number	CP-9020196-UK
Zero RPM Fan Mode	At low and medium loads the cooling fan switches off entirely for near-silent operation
Compatible Devices	pc
Connector Quantity	4
Power Supply Design	Full Modular
Maximum Input Voltage	240 volts
Minimum Input Voltage	100 volts

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Corsair RM850, RM Series, 80 Plus Gold Certified, 850 W Fully Modular ATX Power Supply - Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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