Corsair RM650x (2021) power supply review

PSU - Power Supply Units 105 Page 2 of 8 Published by


Certification, Specs and Features

Energy efficiency certification

Corsair offers the RMx series PSUs as a Gold rated power supply as certified by the 80 PLUS organization (the people that certify and test efficiency). We already explained a little what that literally means. But what does such a certification entail? Well, 80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. That is, such PSUs will waste 20% or less electric energy as heat at the specified load levels, thus reducing electricity use and bills compared to less efficient PSUs. Sometimes, rebates are given to manufacturers who use 80 Plus-certified PSUs.

80 Plus test type115 V internal non-redundant230 V internal redundant
Percentage of rated load10%20%50%100%10%20%50%100%
80Plus 80% 80% 80%
80Plus Bronze 82% 85% 82% 81% 85% 81%
80Plus Silver 85% 88% 85% 85% 89% 85%
80Plus Gold 87% 90% 87% 88% 92% 88%
80Plus Platinum 90% 92% 89% 90% 94% 91%
80Plus Titanium 90% 92% 94% 90% 90% 94% 96% 91%


But there is plenty to choose from, we have standard 80plus, Bronze, Silver, Gold, Platinum, and even Titanium certifications. A PSU that is certified 80 PLUS Gold or 80 PLUS Platinum is more efficient than your regular unit. Today's tested PSU is certified by the 80 PLUS organization to deliver a 90% energy efficiency at 50% load (USA) and 92% efficiency when your PC at 230 Volts (EU) based on 50% load. These units have active PFC with a power factor up to 0.99 and obviously are ErP compliant with a standby power drain below 0.12 watts. 

Corsair RM650x Fully Modular Power Supply
AC Input Rating DC Output Rating
AC Input: 100V - 240V DC Output +3.3V +5V +12V -12V +5Vsb
Current: 10A - 5A Max Load 20A 20A 54A 0.3A 3A
Frequency: 47Hz - 63Hz Maximum Combined Wattage 130W 648W 3.6W 15W
Total Power: 650W
Power consumption for your PC has dropped over the years with all new technologies. These days with a mainstream to high-end PC we recommend a 650 Watt PSU really, that is including the usage of a single high-end graphics card. We mention this because your PC / PSU is the most efficient and energy friendly at half its load, sometimes it might even be wise to get a higher rated power supply. The model tested today is most efficient at 425 Watts, which is pretty much what an enthusiast-class slash powerful PC with a high-end graphics card uses during a game of hefty fragging. 

Corsair RMx series power supplies are 80 PLUS Gold certified and give you extremely tight voltage regulation, virtually silent operation, and a fully modular cable set. With all Japanese 105°C capacitors, they’re a great choice for high-performance PCs where reliability is essential. 

Package contents

  • RMx Series High-Performance ATX Power Supply
  • AC power cord
  • DC Modular cable set
  • Cable ties
  • User Manual


  • Intel Core processor and AMD Ryzen Ready
  • ATX12V v2.4 and EPS 2.92 standards and is backward compatible with ATX12V 2.2, 2.31, and ATX12V 2.01 systems


  • Fully Modular: Only connect the cables your system needs, making clean and tidy builds easier.
  • 135mm Magnetic Levitation Fan: Utilizes a magnetic levitation bearing and custom engineered rotors for high performance, low noise, and superior reliability.
  • Dual EPS12V Connectors: For wide compatibility with modern graphics cards and motherboards.
  • 100% Japanese 105°C Capacitors: Premium internal components ensure unwavering power delivery and long-term reliability.
  • Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.
  • 80 PLUS Gold Certified: High-efficiency operation for lower power consumption, less noise, and cooler temperatures.
  • Zero RPM Fan Mode: At low and medium loads the cooling fan switches off entirely for near-silent operation.
  • Resonant LLC Topology with DC-to-DC Conversion: Provides clean, consistent power reduces coil whine for quieter operation, and enables use of more energy-efficient sleep states.
  • Ten-Year Warranty: Your guarantee of reliable operation that will last across several system builds.

The RMx Series allows for the fan to remain off at low to medium loads for virtually silent operation. And when you’re pushing it hard, the thermally controlled fan adjusts its speed to provide optimal cooling with minimal noise.

Share this content
Twitter Facebook Reddit WhatsApp Email Print