Corsair
Corsair RMx Shift 850 Watt 80 Plus Gold ATX Fully Modular Power Supply
Best power supply for builders prioritizing clean cable management and modern hardware.
The Corsair RMx Shift 850 Watt power supply introduces a revolutionary side cable interface for exceptionally convenient PC building and cable management. This fully modular unit delivers 80 PLUS Gold efficient power, ensuring steady output up to 90% efficiency. It features ATX 3.0 compliance and includes PCIe 5.0 12VHPWR cables for modern GPUs. Built with industrial-grade 105°C-rated Japanese capacitors for long life, it is backed by a ten-year warranty. A 140mm fluid dynamic bearing fan operates quietly, utilizing Zero RPM mode for silent performance under lighter loads, making it an ideal choice for reliable, accessible power.
$244.99
Owner Satisfaction
4.7
/ 5
Category Rank
28
/ 1062
#28 in Computer Power Supplies
Price vs Category Average
-74%
Below average
Wattage Output
850
/ Watts
Who it's for
- PC builders seeking effortless cable management and cleaner aesthetics
- Power users prioritizing long-term component reliability and energy efficiency
- Quiet-computing enthusiasts working in noise-sensitive environments
Who should skip it
- Owners of compact or legacy cases with limited side clearance
- Budget-conscious shoppers looking for standard power supply pricing
- Builders using cases with restrictive or narrow PSU shrouds
Performance breakdown
Cable Management
Side-mounted interface makes routing cables significantly cleaner and more intuitive.
Power Efficiency
Gold-rated efficiency ensures minimal energy waste during heavy system loads.
Acoustic Performance
Zero RPM mode keeps the unit whisper-quiet during standard desktop tasks.
Component Reliability
Japanese capacitors provide long-term stability and peace of mind for builders.
Future Readiness
ATX 3.0 compliance ensures seamless support for the latest high-end GPUs.
Build Flexibility
Fully modular design allows for a clutter-free interior in most cases.
Key Specs
Wattage Output
850 Watts
Form Factor
ATX
Modularity
Fully-Modular
Efficiency Rating
80 PLUS Gold Certified
Cooling
140mm Fluid Dynamic Bearing Fan with Zero RPM Mode
Capacitors
100% Industrial-grade, 105°C-rated Japanese electrolytic capacitors
Dimensions
150.00 mm (W) x 83.82 mm (H) x 180.00 mm (D)
Weight
2.00 kg
Features
- Revolutionary side cable interface for easier building and connection management
- ATX 3.0 certified, supporting modern GPUs with included PCIe 5.0 12VHPWR cables
- Fully modular design using CORSAIR Type 5 Gen 1 micro-fit connectors to reduce cable clutter
- Virtually silent operation at low and medium loads due to Zero RPM mode support
- High reliability backed by a ten-year limited warranty
- SLI and CrossFire compatible for multi-GPU setups
- No integrated LED lighting for a stealth build aesthetic
What customers say
The innovative side mounted cable connections are the defining feature customers celebrate most about the RMx Shift. This thoughtful design dramatically simplifies installation and cable management, offering unparalleled ease of use, particularly in modern PC cases. Users consistently confirm the expected high quality and reliability of the RMx platform, noting its quiet operation. The convenience factor elevates this unit beyond standard power supplies, providing genuinely useful utility that streamlines the building experience.
Know before you buy
The side-mounted interface moves the cable connections to the side of the power supply rather than the back. This design provides easier access to your cables during installation and helps reduce sharp bends, making it much simpler to manage and route cables in tight PC cases.
Yes, the RMx Shift is ATX 3.0 certified and includes a dedicated PCIe 5.0 12VHPWR cable. This allows you to power modern, high-performance GPUs directly without needing bulky adapters.
The power supply features a 140mm fluid dynamic bearing fan designed for quiet operation. It also includes a Zero RPM mode, which keeps the fan completely off during low and medium loads for silent performance.
While it follows the standard ATX form factor, the side-mounted cable interface requires a case with enough clearance on the side panel side to accommodate the connectors. We recommend checking your case's internal layout to ensure there is sufficient space for the cables to exit the side of the unit.
An 80 PLUS Gold rating indicates that the power supply is highly efficient, delivering up to 90% efficiency under typical loads. This means less power is wasted as heat, which can lead to lower electricity consumption and a cooler-running system.
No, this unit uses CORSAIR Type 5 Gen 1 micro-fit connectors. These are specific to the RMx Shift series, so you should only use the cables provided in the box to ensure safety and compatibility.
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$245