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Corsair RM Series 550W Power Supply Review

Author: Lee Garbutt
Manufacturer: Corsair

A Detailed Look

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The Corsair RM550 power supply features a scratch-resistant black matte finish and measures 160mm (6.3”) deep. The unit incorporates a single 135mm fan for cooling and all the cables are modular.

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Note the fan-less operation sticker that alerts new users to the fact that the fan does not start spinning until the PSU is under moderate load. The backside panel features an open grill and includes a power receptacle and master On-Off switch.  The honey comb grill allows air to exhaust out of the power supply for cooling the internal components with minimal turbulence and noise.

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The RM Series 550W power supply uses a Corsair labeled 135mm fan (NR135L). Corsair says “the custom-designed fan has an optimized blade profile for low-turbulence airflow and near-silent operation even at full speed”. The fan is rated for 0.22A at 12 VDC.

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The front panel contains seven modular power receptacles and one data receptacle for Corsair Link. All of the modular cables are flat, ribbon-style to help minimize air resistance and maximize case airflow. The cables are nice and long, with the 24-pin ATX and PCI-E cables measuring 25” long (63.5mm) and the 4+4-pin ATX/EPS cable measuring 26” long (66mm).

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Corsair Link

If you are interested in setting up Corsair’s Corsair Link monitoring and control software on your PC, the RM Series PSU is ready with fan speed and +12V rail current monitoring. The PSU comes with a basic Corsair Link cable (long, thin cable at the bottom of the photo above) that can be connected to a Corsair Link Cooling Node or a Corsair Link USB Dongle (both optional). Previously the Corsair Link option was only available on Corsair’s premium AX Series Digital power supplies.

Under the Hood

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Corsair appears to once again be using the CWT as the OEM for the RM Series 550W  power supply. The PSU uses DC-to-DC converters to create the 3.3V and 5.5V outputs from the +12V rail. Note the small daughter card on the side with the heavy gauge red (+5V) and orange (+3.3V) wires coming off the top and going to the modular connector board.    

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The single main capacitor (Nippon Chemi-Con) on the primary is rated at 390uF, 400V, and 105°C.  The secondary also features Nippon Chemi-Con electrolytic caps for filtering with a handful of solid polymer caps on the DC-to-DC converter board.

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September 23, 2013 | 02:15 AM - Posted by sergio (not verified)

What do you think, is it OK to use this power supply in bottom-mounted-PSU cases? My concern is fan outake in limited space and directed downwar.? On loads below 50%, what's going to be with heat dissipation?

September 23, 2013 | 08:18 AM - Posted by jonnyguru (not verified)

sergio: Fans in power supplies are intake, not exhaust.

September 23, 2013 | 04:22 PM - Posted by Anonymous (not verified)

2 pci-e connectors a positive? That should be a negative. All 550w psu's in this day and age should have 4 pci-e connectors.

September 24, 2013 | 05:45 AM - Posted by rrr (not verified)

Unless you plan on running stuff like 2x 670 or 2x 7950, which is pushing 550W unit, I disagree.

2 PCI-E is IMO fine for 550W. Not so for 650W OTOH.

December 16, 2013 | 05:43 PM - Posted by psumaster (not verified)

There are videocards coming with 3 PCI-E, so I think at least 3 would be a good number. 2 PCI-E should be the default for 400W units.

May 17, 2015 | 05:22 AM - Posted by Anonymous (not verified)

Many new cards come with 1x6-8 pin, because they are efficent.

You can do Asus Strix 970 SLI with this PSU for example.

September 24, 2013 | 09:19 AM - Posted by Mark "Dusty" D (not verified)

Lee, on the Specifications and Packaging page, the efficiency and fan noise curves show the x axis as sytem load (watts), but it is expressed in percentages of full load. Conversely, on the DC Load Regulation and AC Ripple page, it shows the wattage being drawn but would be more helpful in percent of full load.

March 1, 2014 | 07:05 PM - Posted by Anonymous Cowerd (not verified)

Would like an article
that compares the cost between the common recommendation
by all to take a PSU that's double your consumption
and a PSU that's just enough above your system consumption.

Example for calculated comparison:
PC1 peek consumption is 380w - PSU is 450W.
PC2 peek consumption is 380W - PSU is 750W.
(both the same 80+ rate)

PC#1 would be far from optimal, but buying cost is low.
PC#2 is in middle of the bell curve efficiency chart,
but cost more!

since the drop between PSU #2 & #1 efficiency is just few percent's would it make buying the more expansive PSU worth while, for the average warranty of the PSU?

Such article would greatly benefit PCPER community.

August 13, 2015 | 09:03 PM - Posted by Dennis (not verified)

I would be very interested to know ..

What is the standing CURRENT drawn from 240V mains during computer shutdown for the RM550.

I have another supply that draws maybe 200mA from the mains but out-of-phase. PF in shutdown is close to 0. Hence only 2 or 3 watt power draw. But that standing 200mA from the mains does not allow a power-saver power board to sense computer shutdown and switch off other accessories (Monitor etc).

Maybe a small plus for my recalcitrant supply during computer shutdown could be that it actually performs a SMALL power-factor correction for the rest of the office :-)

November 2, 2016 | 08:17 AM - Posted by Raees dar (not verified)

I love corsair Rm 550 and I have it.
buy this product with closed eyes.

January 12, 2017 | 06:14 AM - Posted by Anonymous (not verified)

So is it good? Should i buy it with Corsair Carbide Wamp/Spec 01?

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