CORSAIR RM650 POWER SUPPLY

The Corsair RM650 is a modular 650W ATX power supply. The MSRP is $129.99.

corsair-rm650
  • RM650
  • CP-9020194-NA
  • 2 EPS12V cables
  • 2 pig-tail PCIe cables
  • 2 SATA strands with 3 connectors each
  • 1 Molex cable
  • Hon Hua HA1425M12F-Z fan
  • Supports Modern Standby mode
  • Efficient under light loads
  • Active PFC
  • Over Voltage Protection
  • Under Voltage Protection
  • Over Power Protection
  • Over Temperature Protection
  • Over Current Protection
  • Short Circuit Protection
  • 152 x 87 x 162mm
  • 54A 12V power

The Corsair RM650 is very feature rich compared to the earlier 2013 RM650 with the orange label. The white label on the black paint will appeal for those using the recent white painted chassis.

80 plus gold

The small size means it can fit even mid tower ATX chassis easily with lots of room to connect cables.

  • 80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise and cooler temperatures.
  • Tuned for Low Noise Operation: A 140mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load.
  • 105°C-Rated Capacitors: Industrial-grade capacitors deliver solid electrical performance and reliability.
  • Microsoft Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.
  • Zero RPM Fan Mode: At low and medium loads the cooling fan switches off entirely for near-silent operation.
  • Fully Modular Cables: Only connect the cables your system needs, making clean and tidy builds easier.
  • SLI Ready: Power multiple GPUs for maximum gaming performance.
  • Compact Size: A 160mm-long casing ensures an easy fit in almost all modern enthusiast PC cases.
  • Ten-Year Warranty: Your guarantee of reliable operation that will last across several system builds.

For a build using a single video card with 2 PCIe cables the RM650 is well suited to handling gaming for hours on end. The modular cable design has been very popular as it eliminates unneeded cables which makes a machine more more neat and tidy.

Peripheral cables are now more widely used with modern machines with several fans installed. Some modern cream puff rigs have water cooling which needs even more perpheral power. The RM650 is generous with 4 plugs for perpheral cables. This allows for a wider range layouts to suit any build .

MODERN STANDBY

The specification describes a Microsoft proprietary standard for Windows 8 software and hardware that developers and hardware vendors can optionally comply with to enable devices to be turned on and off instantly. It also allows the operating system to continue performing background tasks, such as updating content from apps, when a device is not being used. Devices must be able to turn on in less than 500 milliseconds.

  • TPM 2.0
  • M.2 SSD boot device
  • Passive cooling on standby
  • BIOS support for the standard

Although Modern Standby enables an instant on/off user experience like Connected Standby, Modern Standby is more inclusive than the Windows 8.1 Connected Standby power model. Modern Standby allows for market segments previously limited to the Traditional Sleep (S3) power model to take advantage of the low power idle model. Example systems include systems based on rotational media and hybrid media (for example, SSD + HDD or SSHD) and/or a NIC that doesn’t support all of the prior requirements for Connected Standby.

The number of systems supporting Modern Standby rather than S3 is increasing over time. The Modern Standby section outlines important changes, partner requirements, and best practices for enabling Modern Standby.

When the user causes the system to resume from standby, e.g. presses the power button, the display is immediately turned on and networking devices are restored to their normal, active operating modes. The time from the power button press to the display turning on is less than one second. After the display is turned on and the networking device returns to normal operating mode, desktop applications resume and the system returns to its normal, screen-on active behavior.

rm650 rear IO

For testing the GTX 690 SLI was placed in the MSI X470 Gaming Plus and pigtail cables were used. The machine booted up immediately with the dual cards operating fine. The GTX 690 SLI is well over 400W of power when loaded and the Furmark benchmark did not cause the overload protection to trip.

Corsair RM650 internals

Load testing using the carbon pile, the RM650 it delivered well over 60A before it tripped the overload protection which is over 720W of actual power output. The RM650 fan was running at max with load testing but the thermal overload did not trip at 650W making it an amazing value. This means the RM650 can hack it when the RTX 2080 Ti SLI video cards are in full boost mode just fine. As long as the primary load is not too high intermittent boost is tolerated fine. The power draw in games varies substantially which is why the stress test is of interest.

There are four 12V connectors so it possible to use a video card with dual 8-pin connectors like an RTX 3080 which needs 320W itself. The 650W capacity still has room for the motherboard, CPU and other components. It’s also the reason that the new RM650 is the lowest capacity model, video card power loads have increased.

CWT is the manufacturer of the RM650. The build quality is slightly inferior compared to the more expensive RM650x. A mitigating advantage is the support for the Windows 10’s new Modern Standby mode, which allows the PC to boot reliably within a five seconds period.

The primary side only uses a lower rated power GBU806 bridge rectifier. 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV handle the inrush current and primary feed. The voltage controlled IPA60R190P6 FET adjusts the feed dynamically depending on the load.

Low power idle made the RM650 a real winner. The Athlon 3000G parked on a B350M motherboard uses very little power at idle and the RM650 was still well above 70% at ultra low power. This will save a bundle as older designs can be less than 40% at very low power levels.

Some gripes over the Hong Hua fans, mostly about ticking noises at lower speeds. The zero fan feature means that most of the time the PSU fan does not even run unless the heat reaches a threshold. So while slightly cheaper made using Chinese capacitors etc, Corsair has enough confidence in the hardware to offer a 10 year warranty.

In a modern bottom mounted chassis the RM650 even when loaded with a high powered video card manages to stay below 40°C most of the time. The carbon pile was able to get almost 825W of power before the OCP tripped. This means the RM650 will handle long hours with gaming just fine.

The 80 plus gold efficiency and the 10 year warranty will make the RM650 a winner in almost anyone’s gaming rig.

The old post on the ATX Power Supply is still the most comprehensive guide for understanding PC power supplies.

REAL GPU POWER REQUIREMENTS

The typical gaming enthusiast graphics card used more power than most realise, The graphic shows the real story with NVIDIA cards.

The EVGA RTX 2080 uses 215W standard power limit with a boost of 240W maximum. The RM650 has plenty of power to handle the EVGA RTX 2080 playing games for hours on end.