Corsair
RMx Series RM550x
Best reliable power supply for quiet, efficient mid-range PC builds.
The CORSAIR RMx Series RM550x is a 550-watt power supply unit designed for reliable and efficient PC builds. It features 80 PLUS Gold certification for high efficiency, reducing heat and operating costs. This fully modular PSU utilizes 100% Japanese 105°C capacitors for stable power delivery and long-term dependability. It offers extremely tight voltage control and virtually silent operation, with a zero RPM mode for quiet performance at low loads. The unit comes with a comprehensive ten-year warranty, ensuring peace of mind across multiple system upgrades.
$114.99
Owner Satisfaction
4.7
/ 5
Category Rank
28
/ 1062
#28 in Computer Power Supplies
Price vs Category Average
-88%
Below average
PATA Connector
4
Who it's for
- Budget-conscious users looking to minimize long-term electricity costs
- System builders prioritizing long-term hardware stability and peace of mind
- Quiet-computing enthusiasts seeking a silent desktop experience
Who should skip it
- Shoppers prioritizing affordability over premium build quality
- Gamers powering high-end, power-hungry graphics cards
- Builders working within cramped, small-form-factor PC cases
Performance breakdown
Component Reliability
Premium Japanese capacitors ensure long-term stability under demanding thermal conditions.
Acoustic Performance
Zero RPM fan mode keeps your workspace silent during light workloads.
Cable Management
Fully modular design simplifies installation and keeps internal airflow clutter-free.
Power Efficiency
80 PLUS Gold certification minimizes energy waste and reduces operating heat.
Voltage Stability
Tight voltage regulation provides consistent power for sensitive system components.
Longevity Assurance
A decade-long warranty offers exceptional peace of mind for future upgrades.
Key Specs
PATA Connector
4
Protections
OVP (Over Voltage) | UVP (Under Voltage) | SCP (Short Circuit) | OTP (Over Temp) | OPP (Over Power)
EPS Connector
1
SATA Connector
6
Fan Bearing Technology
Rifle
Modern Standby
No
Dimensions
150mm x 86mm x 160mm
Modular
Fully
Features
- Fully modular cable set for easy installation and cable management.
- Virtually silent operation with a zero RPM fan mode.
- 100% Japanese 105°C capacitors for premium reliability.
- Extremely tight voltage control for stable power delivery.
- 80 PLUS Gold certified for high efficiency and lower energy costs.
- Ten-year warranty provides long-term assurance.
What customers say
Customers consistently praise the Corsair RM550x for its exceptional reliability and robust build quality. Many users highlight its dependable performance, ensuring stable power delivery for their systems over extended periods. The fully modular design also receives positive remarks for simplifying installation and improving cable management, contributing to an overall premium user experience. This power supply is frequently recommended for its consistent, worry free operation.
Know before you buy
A fully modular design means every cable can be detached from the power supply unit. This allows you to use only the cables your specific components require, which significantly reduces clutter and improves airflow inside your case.
The RM550x is designed for quiet operation. It features a Zero RPM fan mode, which keeps the fan completely off during low to medium loads, meaning you won't hear a thing while browsing or performing light tasks.
550 watts is sufficient for most mid-range builds featuring a single graphics card and a standard CPU. However, if you are planning to use high-end, power-hungry components, you should calculate your total system wattage to ensure this unit meets your specific requirements.
This certification indicates that the power supply operates at a high level of efficiency, converting more electricity into usable power for your components rather than wasting it as heat. This results in lower energy consumption and less strain on your hardware over time.
The RM550x includes six SATA connectors for your storage drives and two PCIe connectors for your graphics card. It also provides one EPS connector and four PATA connectors, covering the needs of most standard desktop configurations.
This unit uses 100% Japanese 105°C capacitors, which are widely considered the gold standard for durability and stable power delivery. Combined with a ten-year warranty, this PSU is built to remain a reliable part of your system through multiple hardware upgrades.
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$115