Corsair
Corsair RM850X SHIFT 850 Watt Power Supply
Best power supply for enthusiasts building modern, high-performance gaming PCs.
The CORSAIR RMx SHIFT Series is a fully modular power supply designed for modern PC builds. It features a unique side-mounted interface for easy access to connections and includes a native 12V-2x6 cable for the latest GPUs. With Cybenetics Gold-certified efficiency and ATX 3.1 compliance, it ensures reliable and efficient power delivery. This PSU is built with 105°C-rated Japanese capacitors for enhanced durability and comes with a ten-year warranty. It also boasts a quiet 140mm fluid dynamic bearing fan with Zero RPM mode for silent operation at low loads, and an adjustable fan speed knob for customized cooling.
$149.99
Owner Satisfaction
4.7
/ 5
Category Rank
28
/ 1062
#28 in Computer Power Supplies
Price vs Category Average
-84%
Below average
Cooling Fans
140
/ mm Fluid Dynamic Bearing Fan
Who it's for
- System builders struggling with cramped cable management
- Quiet-computing enthusiasts prioritizing silent operation
- Gamers upgrading to the latest high-performance hardware
Who should skip it
- Owners of compact cases with tight side-panel clearance
- Budget-conscious shoppers seeking standard power supply value
- Users with oversized chassis requiring longer cable reaches
Performance breakdown
Cable Management
Side-mounted interface makes routing cables in tight spaces remarkably simple.
Acoustic Performance
Fluid dynamic bearing fan remains whisper-quiet even under moderate system loads.
Future Proofing
Full ATX 3.1 compliance ensures seamless support for next-generation GPU hardware.
Build Reliability
Japanese capacitors and a ten-year warranty guarantee long-term operational stability.
Power Efficiency
Cybenetics Gold certification minimizes energy waste during intensive gaming sessions.
Installation Versatility
Fully modular design allows for a clean build with zero unnecessary clutter.
Key Specs
Cooling Fans
140mm Fluid Dynamic Bearing Fan
Wattage
850 Watts
Form Factor
ATX
Color
Black
ATi CrossFire
CrossFire Compatible
NVIDIA SLI
SLI Compatible
Modular
Fully-Modular
ATX Connector
20+4-pin
Features
- Fully modular design for easy cable management
- ATX 3.1 compatible for latest hardware support
- Cybenetics Gold certified for high efficiency
- 105°C Japanese capacitors for reliability
- Quiet 140mm fluid dynamic bearing fan with Zero RPM mode
- Side-mounted interface for accessible connections
- Includes native 12V-2x6 cable for modern GPUs
- Ten-year warranty for peace of mind
What customers say
Customers consistently praise the Corsair RM850X SHIFT for its innovative side mounted cable connections, significantly enhancing ease of installation and cable management within PC builds. This design choice is a standout feature, simplifying what can often be a frustrating process. Beyond its clever layout, users frequently highlight the power supply's robust quality and dependable performance. It delivers stable power, operating quietly, which reinforces its reputation for reliability. The combination of thoughtful design and solid construction makes it a highly regarded component for enthusiasts and builders alike.
Know before you buy
The side-mounted interface moves the cable connections from the back of the unit to the side, facing the cable management side of your case. This design significantly improves accessibility, making it much easier to plug in or remove cables without needing to reach into tight, cramped spaces.
Yes, the RM850x SHIFT is ATX 3.1 compliant and includes a native 12V-2x6 cable. This allows you to power modern, high-performance GPUs directly without the need for bulky adapters.
The Zero RPM mode allows the 140mm fan to remain completely stationary during low to medium loads, ensuring silent operation. The fan will only begin to spin once the power supply reaches a certain temperature threshold, providing cooling exactly when it is needed.
The RM850x SHIFT follows the standard ATX form factor with a depth of 6.3 inches. While it fits most standard ATX cases, the side-mounted cable design requires a case with sufficient clearance on the cable management side to accommodate the connectors.
Cybenetics Gold certification indicates that this unit maintains high efficiency levels across various load conditions. This means less power is wasted as heat, which can lead to lower electricity consumption and a cooler-running system compared to lower-rated power supplies.
Yes, this is a fully modular power supply. You only need to connect the cables required for your specific components, which helps reduce clutter inside your case and improves overall airflow.
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