Corsair
Corsair RM850x
Best reliable power supply for high-performance custom PC builds.
The CORSAIR RM850x is a fully modular ATX power supply designed for high-efficiency power delivery. It boasts 80 PLUS Gold certification, ensuring up to 90% peak efficiency for reduced heat and noise. Featuring a 135mm magnetic levitation fan, it offers quiet operation at low to medium loads with Zero RPM Fan Mode. Built with a robust resonant LLC topology and 100% Japanese capacitors, it provides reliable performance and supports Microsoft Modern Standby for fast wake-from-sleep times. This refurbished unit comes with multiple EPS12V connectors for broad compatibility.
$99.00
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Owner Satisfaction
4.7
/ 5
Category Rank
19
/ 1062
#19 in Computer Power Supplies
Price vs Category Average
-89%
Below average
Model
850
/ RMx
Who it's for
- System builders prioritizing long-term component longevity and peace of mind
- Quiet-computing enthusiasts working in noise-sensitive environments
- PC builders aiming for clean aesthetics and optimized internal airflow
Who should skip it
- Budget-conscious shoppers looking for the most affordable power solution
- Builders working within cramped, space-constrained PC chassis
- Small form factor enthusiasts using specialized compact cases
Performance breakdown
Power Stability
Resonant LLC topology ensures rock-solid voltage delivery under heavy gaming loads.
Acoustic Performance
Magnetic levitation fan and zero-RPM mode keep operation whisper quiet.
Build Quality
Premium Japanese capacitors provide exceptional long-term reliability and component longevity.
Cable Management
Fully modular design simplifies installation and keeps your PC interior clean.
Energy Efficiency
80 PLUS Gold certification minimizes wasted heat and reduces electricity costs.
System Compatibility
Multiple EPS12V connectors offer broad support for modern high-end motherboards.
Key Specs
Model
RM850x
Part No.
CP-9020200/75-003898
AC Input
100–240V
Input Current
10A-5A
Frequency
47~63Hz
+3.3V Max Load
20A
+5V Max Load
20A
+12V Max Load
70.8A
Features
- Fully modular design for cleaner builds and easier cable management.
- 135mm magnetic levitation fan for quiet and reliable cooling.
- Zero RPM Fan Mode for silent operation at low to medium loads.
- High efficiency (up to 90%) reduces heat and energy consumption.
- Robust LLC resonant topology with DC-DC conversion for stable power.
- 100% Japanese electrolytic capacitors ensure longevity and reliability.
- Supports Microsoft Modern Standby for faster system wake-up.
- Includes multiple EPS12V connectors for broad motherboard compatibility.
What customers say
Customers consistently praise the Corsair RM850x for its exceptional reliability and robust build quality. Many highlight its remarkably quiet operation, with the fan often remaining silent under typical loads, contributing to a peaceful computing environment. Users frequently commend the fully modular design for simplifying installation and cable management, enhancing the overall user experience. The product is widely considered a dependable and premium choice, offering excellent performance and peace of mind for demanding systems.
Know before you buy
A fully modular design means every cable can be detached from the power supply. You only plug in the cables you actually need, which significantly reduces clutter inside your case and improves airflow.
The Zero RPM mode keeps the fan completely off during low to medium workloads, ensuring silent operation. The fan only begins to spin once the power supply reaches a certain temperature threshold, making it ideal for quiet environments.
Yes, the RM850x includes three EPS12V connectors, providing broad compatibility with most modern motherboards. It also supports Microsoft Modern Standby, which allows for faster wake-from-sleep times on compatible systems.
The 80 PLUS Gold rating indicates that this unit operates at up to 90% efficiency. This means less power is wasted as heat, which lowers your energy consumption and helps the unit run cooler and quieter.
This unit is built with 100% Japanese electrolytic capacitors, which are widely considered the industry standard for longevity and reliability. Combined with a robust LLC resonant topology, it is designed to provide stable, consistent power delivery over time.
Yes, the RM850x is multi-GPU ready and comes equipped with four PCIe connectors. With 850 watts of continuous power, it has sufficient headroom to support demanding graphics configurations.
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$99