Corsair PSU. RMx Series RM850x Fully Modular Power Supply

The Corsair RMx Series RM850x 850W Fully Modular Power Supply delivers reliable 80 PLUS Gold and Cybenetics Gold-rated power with virtually silent operation, built with the highest quality components for dependable performance. With fully modular Type 4 cabling, ultra-quiet 135-140mm rifle bearing or magnetic levitation fan with Zero RPM Mode, 105°C-rated Japanese electrolytic capacitors, and comprehensive protection features, this power supply provides consistent electrical performance with superior efficiency and minimal noise for high-performance gaming and workstation PCs.

Key Features:

>850W continuous power output on a single +12V rail (70.8A) for stable, reliable performance >80 PLUS Gold certified for up to 90% efficiency at real-world loads, reducing power consumption and heat generation >Cybenetics Gold efficiency rating (87-89% at 115V, 89-91% at 230V) for lower energy costs >Cybenetics A- noise rating for exceptionally quiet operation (25-30 dBA average) >Built with 100% industrial-grade, 105°C-rated Japanese electrolytic capacitors for unwavering power and reliability >Ensures reliable power for your PC, even under high-stress conditions >Fully modular Type 4 low-profile, all-black cables allow you to connect only what you need for cleaner wiring and improved airflow >Ultra-quiet 135mm rifle-bearing fan (original/2018 model) or 140mm magnetic levitation bearing fan (2021 model) with Zero RPM Mode >Zero RPM Fan Mode allows the fan to remain off at low to medium loads for virtually silent operation >Fan doesn't spin until needed, keeping noise minimal during idle and light workloads >Thermally controlled fan intelligently adjusts speed based on load for optimal cooling and minimal noise >ATX 3.1 compliant supporting PCIe 5.1 (2024 model CP-9020270) or ATX12V v2.4 and EPS 2.92 standards (older models) >Native 12V-2x6 (12+2-pin) connector capable of 600W for next-gen graphics cards (2024 model only) >Supports 2x transient power excursions from GPU up to 200% max power (ATX 3.1 model) >Three EPS connectors for ultra-high-end mainboards requiring multiple CPU power cables >Multi-GPU ready for SLI and CrossFire configurations >Continuous full power delivery rated at 47°C (2021 model) or 50°C ambient temperature >Compact 160mm length (standard models) or 180mm (white variant) for easy installation in ATX cases >Comprehensive protection: Over Voltage, Under Voltage, Over Current, Over Power, Short Circuit, Over Temperature >100,000 hours MTBF (Mean Time Between Failures) for exceptional reliability >Industry-leading 10-year manufacturer warranty with world-class CORSAIR support

Technical Specifications:

Model Number	CP-9020180-NA (2018), CP-9020200-NA (2021), CP-9020270-NA (2024 ATX 3.1), CP-9020270-IN (India)
Internal Model	RPS0124 (2018/2021), RPS0197 (2024)
Part Number	75-003898 (2021), 75-005876 (2024)
Brand	Corsair
Series	RMx Series (Multiple generations: 2018, 2021, 2024)
Color	Black (also available in White - CP-9020156)
Wattage	850W (Continuous Power)
Form Factor	ATX
ATX Version	ATX12V v2.4 (2018/2021) / ATX 3.1 (2024 model)
PCIe Version	Standard (2018/2021) / PCIe 5.1 Ready (2024 model)
EPS Version	EPS12V 2.92
Efficiency Certification (230V)	Cybenetics Gold (89-91% efficiency)
Efficiency Certification (115V)	Cybenetics Gold (87-89% efficiency)
80 PLUS Certification	80 PLUS Gold (up to 90% efficiency at real-world loads)
Noise Rating	Cybenetics A- (25-30 dBA average)
Modularity	Fully Modular
Cable Type	Type 4 (Low-profile, All Black / Sleeved and Flat Black)
AC Input Voltage	100-240V (Auto-ranging)
AC Input Current	10A @ 100V / 5A @ 240V (2024) or 12A @ 100V / 6A @ 240V (2021)
Frequency	47-63Hz (50-60Hz)
+3.3V Rail	20A (2024) or 25A (2018/2021) (150W combined with +5V)
+5V Rail	20A (2024) or 25A (2018/2021) (150W combined with +3.3V)
+12V Rail	Single +12V rail, 70.8A (849.6W / 850W)
-12V Rail	0.8A (9.6W)
+5Vsb Rail	3A (15W)
Cooling	135mm Rifle-Bearing Fan (2018) or 140mm Magnetic Levitation Bearing Fan (2021/2024, Low Noise)
Zero RPM Mode	Yes (Selectable, fan stops at low/medium loads)
Modern Standby Compatible	Yes - Alternative Low Power Mode support (2024 model)
iCUE Compatibility	No
CORSAIR Link Ready	No
MTBF	100,000 hours
Capacitor Rating	105°C-rated 100% Industrial-Grade Japanese Electrolytic Capacitors
Continuous Output Rated Temp	47°C (2021) / 50°C (2018/2024)
Operating Temperature	0-50°C
Multi-GPU Ready	Yes (SLI/CrossFire)
Single/Multi-Rail Toggle	No (Single rail only)

Connectors:

ATX 24-Pin Connector	1
EPS 4+4-Pin Connector	2-3 (2 for older models, 3 for 2021 model)
PCIe 6+2-Pin Connector	6 (6 separate cables for older models) or 3 (3 cables for 2024 model)
12V-2x6 PCIe 5.1 Connector (16-pin)	1 (600W capable, 2024 ATX 3.1 model only, also called 12+2-pin)
SATA Connector	10 (Multiple cables)
PATA (Molex / 4-Pin Peripheral)	8 connectors or 1 cable with multiple connectors
Floppy Connector	1

Protection Features:

>Over Voltage Protection (OVP) >Under Voltage Protection (UVP) >Over Current Protection (OCP) >Over Power Protection (OPP) >Short Circuit Protection (SCP) >Over Temperature Protection (OTP)

Dimensions & Weight:

Dimensions (L x W x H)	160mm x 150mm x 86mm (Standard Black) / 180mm x 150mm x 86mm (White variant)
Max PSU Length	160mm / 180mm
Weight	3.38 kg / 3.66 lbs (2018) / 1.985 kg (White) / 1 kg (2024)

Package Contents:

>CORSAIR RM850x Power Supply Unit >Fully Modular Cable Set (Type 4): >1x ATX 24-Pin Cable >2-3x EPS 4+4-Pin Cables >3-6x PCIe 6+2-Pin Cables (or 1x 12V-2x6 600W cable for 2024 model) >Multiple SATA Power Cables (10 total connectors) >Multiple PATA (Molex) Power Cables (8 total connectors) >1x Floppy Power Connector >AC Power Cord >Cable Ties/Straps >Mounting Screws >User Manual >10-Year Warranty Card

Perfect for high-performance gaming PCs, enthusiast workstations, content creation builds, multi-GPU setups, Intel Core i7/i9 and AMD Ryzen 7/9 platforms, high-end GPU builds (RTX 40-series, RX 7000-series), systems requiring reliable Gold-certified power with virtually silent operation, quiet PC builds, and anyone seeking dependable, efficient, fully modular power delivery with long-term reliability backed by a 10-year warranty. The Corsair RMx Series RM850x is a fully modular 850W ATX power supply built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC with virtually silent operation—available in multiple generations (2018, 2021, and 2024 ATX 3.1 models) all providing reliable performance. The latest 2024 model (CP-9020270) is ATX 3.1 compliant supporting PCIe 5.1 with a native 12V-2x6 (12+2-pin) connector capable of delivering 600W for modern graphics cards such as NVIDIA RTX 40-series, with support for 2x transient power excursions up to 200% of max power resisting power spikes from next-gen GPUs, while older models use ATX12V v2.4 and EPS12V 2.92 standards with traditional PCIe 6+2-pin connectors. 80 PLUS Gold certification delivers up to 90% efficiency at real-world loads, reducing power consumption from the wall, generating less heat, and lowering electricity costs over time. Cybenetics Gold efficiency rating (87-89% at 115V, 89-91% at 230V) and Cybenetics A- noise rating (25-30 dBA average) ensure efficient, quiet operation perfect for noise-sensitive environments. Built with 100% industrial-grade, 105°C-rated Japanese electrolytic capacitors for unwavering power and reliability, the RM850x ensures reliable power for your PC even under high-stress conditions with long-term stability. The ultra-quiet 135mm rifle-bearing fan (2018 model) or 140mm magnetic levitation bearing fan (2021/2024 models) with Zero RPM Fan Mode allows the fan to remain off at low to medium loads for virtually silent operation—the fan doesn't spin at all during idle and light workloads, providing near-silent computing, then intelligently ramps up only when needed with precise thermally controlled speed for optimal cooling and minimal noise. Fully modular Type 4 low-profile, all-black cables (sleeved and flat mix) allow you to connect only the cables your system needs, dramatically reducing cable clutter inside your case and promoting better airflow for improved cooling while delivering clean aesthetics. The 2021 model features three EPS connectors—something hard to find in today's market even in stronger PSUs—perfect for supporting ultra-high-end mainboards requiring multiple CPU power cables. Rated for continuous full power delivery at 47°C (2021 model) or 50°C ambient temperature, the RM850x delivers dependable performance even in thermally challenging environments. The compact 160mm length (standard models) or 180mm (white variant) ensures easy installation in standard ATX cases without compatibility issues. Fully compliant with ATX v2.52 (2021 model) or ATX 3.1 (2024 model), the RM850x provides high overall performance with quiet operation making it ideal for delivering dependable power to today's top-performing PCs. Multi-GPU ready for both SLI and CrossFire configurations. Comprehensive protection circuitry guards against over voltage, under voltage, over current, over power, short circuits, and over temperature conditions, protecting both the PSU and your valuable components. With a robust 100,000-hour MTBF (Mean Time Between Failures) rating and backed by CORSAIR's industry-leading 10-year warranty with world-class support—a must in this price range matching all competing offerings—the RM850x delivers peace of mind and reliable performance for a decade through multiple builds. Available at competitive pricing ($98.99-$169.99 depending on model and sales), this fully modular PSU represents excellent value. Ideal for gaming builds with high-end CPUs and GPUs, multi-GPU configurations, workstations, and anyone seeking reliable Gold-certified power with virtually silent operation and a 10-year warranty, the RM850x provides ample power headroom, efficient performance, ultra-quiet operation, and proven long-term reliability. Upgrade to dependable, efficient, and virtually silent power with the Corsair RMx Series RM850x.