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Corsair RM Series 550 Watt ATX/EPS 80PLUS Gold-Certified Power Supply - CP-9020053-NA RM550

by Corsair
710 customer reviews
| 8 answered questions

List Price: $134.04
Price: $119.07 & FREE Shipping. Details
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  • The latest ATX12V v2.31 and EPS 2.92 standards and it is backward compatible with ATX12V 2.2 and ATX12V 2.01 systems.
  • 4th generation Intel Core processor Ready (Intel Haswell and Z87 motherboards)
  • 80PLUS Gold certified, delivering over 92% energy efficiency at real world load conditions.
  • Low-profile, flat cable design reduces air friction and helps maximize airflow through your computer's chassis.
  • High-quality Japanese capacitors provide uncompromised performance and reliability.
  • Active Power Factor Correction (PFC) with PF value of 0.99.
  • Over-voltage and over-current protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components.
  • Universal AC input from 100-240V, A five year warranty and lifetime access to Corsair's legendary technical support and customer service.
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Frequently Bought Together

  • Corsair RM Series 550 Watt ATX/EPS 80PLUS Gold-Certified Power Supply - CP-9020053-NA RM550
  • +
  • Intel Core BX80646I74790K i7-4790K Processor (8M Cache, up to 4.40 GHz)
  • +
  • Samsung 850 EVO 250GB 2.5-Inch SATA III Internal SSD (MZ-75E250B/AM)
Total price: $497.05
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Product Description

Style: RM550

Reliable Operation, Fully Modular Cabling, and Optimized for Silence

The Corsair RM550 is fully modular and optimized for silence and high efficiency. It’s built with low-noise capacitors and transformers, and Zero RPM Fan Mode ensures that the fan doesn’t even spin until the power supply is under heavy load. And with a fan that’s custom-designed for low noise operation, it’s whisper-quiet even when it’s pushed hard. 80 Plus Gold-rated efficiency saves you money on your power bill, and the low-profile black cables are fully modular, so you can enjoy fast, neat builds. And, like all Corsair power supplies, the RM550 is built with high-quality components and is guaranteed to deliver clean, stable, continuous power. Want even more? Connect it to your Corsair Link system (available separately) and you can even monitor fan speed and +12V current directly from your desktop.

Reliable, Continuous Power Delivery

Power ratings are continuous, not peak, for superior protection for your valuable PC. Corsair uses high-quality internal components, and the RM550 is guaranteed to deliver clean, stable, continuous power.

About Corsair Power Supplies

Corsair is the best-selling brand of enthusiast power supplies worldwide. Corsair innovations, like the first DSP-controlled desktop PC power supply, drive our focus on providing reliable, quiet, and efficient PSUs for everything from basic desktop systems to one-of-a-kind dream PCs.

High-quality, Low-noise Capacitors and Transformers

RM Series power supplies are designed with capacitors and transformers carefully selected to eliminate coil whine and other background noise that can be annoying in quiet environments.

Zero RPM Fan Mode

The efficient design of the RM550 means minimal excess heat generation, so the fan doesn't even need to spin under low to medium loads. And when you're pushing it hard, the thermal sensor controls the fan speed to ensure that it gets the cooling it needs without any extra noise.

Corsair NR135L Noise-reducing Fan

The custom-designed fan has an optimized blade profile for low-turbulence airflow and near-silent operation even at full speed.

80 Plus Gold-certified efficiency

Highly efficient RM Series power supplies produce less heat and have lower operating costs.

Flat Black, Low-profile Modular Cables

You can use only the cables you need, and leave the rest in the box for fast, easy, and great-looking builds.

Corsair Link Compatible

Want even more? RM Series power supplies connect to Corsair Link hubs (available separately) for real-time monitoring of fan speed and power delivery directly from your desktop.

Product Information

Style Name: RM550
Expand all Collapse all Technical Details
Brand NameCorsair
Item model numberCP-9020053-NA
Item Weight5.9 pounds
Item Dimensions L x W x H16.80 x 12.40 x 17.60 inches
Color Black
Additional Information
Best Sellers Rank
Shipping Weight6 pounds (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableSeptember 12, 2013
Warranty & Support Return Policy: You may return any new computer purchased from that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellableRead more condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Customer Reviews

Most Helpful Customer Reviews

62 of 65 people found the following review helpful By Eric Jacobson on September 25, 2013
Style Name: RM750 Verified Purchase
The Corsair RM Series is absolutely outstanding from its 80-Plus certification to its CONTINUOUS power ratings to its nearly silent operation plus it truly is fully modular.


The RM series doesn't turn on the fan as long as the computer is using less than 40% of the power output. This means, unless you're beating the heck out of your machine with Maya 3-D modeling or using the entire Adobe Creative Suite at the same time, you will hear NO NOISE from your power supply. I selected this power supply for a whisper-silent build using a NZXT H630 Case, Nexus fans, and a Cooler Master Hyper 212 CPU cooler along with SSDs, so I wanted quiet. The RM series does not disappoint.


When you're selecting a power supply, it is absolutely CRITICAL that you select a supply with a CONTINUOUS power rating, not a PEAK power rating. Continuous means the power supply delivers its power rating the entire time it's on with no dipping. Peak power ratings mean that the power supply can hit that power rating briefly, but cannot sustain that power delivery. If you're talking about gaming video cards and/or running lots of drives, you want continuous power. 80-Plus certification means the power supply runs efficiently, doing the best it can to use as little power as necessary so your utility bills don't skyrocket.


I've been using "modular" power supplies for a few years now, and I've discovered that modular can mean different things to different manufacturers. Some manufacturers believe that modular means that the accessory plugs can be added and taken away, but your main cables such as mobo power and at least one 6-pin power rail are going to permanently attached to the power supply.
Read more ›
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34 of 35 people found the following review helpful By Andrew on October 16, 2013
Style Name: RM850 Verified Purchase
Quiet, affordable and fully modular. Only thing I don't like about it are the pci-e cables. I ripped mine apart to sleeve so it wasn't a big deal, but with my 670 gpu the connectors would have been hard to seat without having done so (one pin up one down on this gpu, and the cables provided seem to be intended for two up/two down)
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25 of 27 people found the following review helpful By Hsiao M. on October 1, 2013
Style Name: RM750
This review is for the 750Watt model, I've purchased on Newegg.

Built quality and style:
Built like a tank! Well-designed body and 140mm black fan grill with solid metal housing. The paint job is top notch, textured matt black, with subtle yellow & white markings. Fan blade color in grey. will look very good with darker types of case and mobo setups. The side edge of the PSU are angled so that they're not sharp. The RM750 felt like a solid piece of equipment out of box. The PSU profile is not oversized- pretty much fit right into my micro atx gaming rig.

Come with c-link cable, mobo (24-pin), cpu (8-pin), molex (3 connectors), molex (4 connectors), two pci-e (6+2 pin dual connectors), two sata (4 connectors), two molex to 4-pin fan adapters. (All cables are flat and comes with text labels)

Noise Level:
One thing that really amazes me is the noise level: I can run the computer most of the time without the RM750 fan ever turning on! The PSU will go "ninja-mode" when under 40% load. and whenever I'm gaming, during full load, the unit's fan is still very quiet.

Will fit any PC setup, Silent operation if you want to build a HTPC. Quiet operation if you are running 3d games. 80-plus gold certified efficiency. All cables are FULLY detachable, including the ATX 24-pin! You can really achieve a clean look (if you have a windowed PC) and clutter-free setup that will help increase airflow inside the case. Flat cables are a plus as they are better for cable management in case if you want to hide them behind the mobo tray.

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49 of 61 people found the following review helpful By Cindy on February 26, 2014
Style Name: RM750
It's been confirmed since last year that any RM series that's shipped out with a lot number below 1341 suffers ffrom a defect of the fan not spinning resulting in the OTP tripping.
This hhas been confirmed by corsair rep themselves.
If you DO have one of these models, judging from the thread they're still shipping out the older ones, either return it to Amazon and roll the dice again or contact corsair and they will send you a newer model with a prepaid shipping label!
Please note this issue is generally caused by ppl with rigs that use less than 50% of the psu power.
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The manufacturer commented on the review below
32 of 40 people found the following review helpful By preventDefault on June 17, 2014
Style Name: RM850 Verified Purchase
A couple days ago my PC started turning off, and when it booted back up it told me that there was a power surge from "an unstable power supply unit." I did some reading, and sometimes the Asus power surge protection on their motherboards can be a false positive, so I thought nothing of it. Some people even go as far as to disable this feature on their boards.

However, in my case, it wasn't lying. The last time I got that message, it rendered my Asus GTX780 useless. Now I get huge graphical glitches everywhere from the POST screen, to BIOS, and booting an OS isn't possible.

Since this was after Amazon's 30 day return period, I have to return it to Corsair directly. I tried registering on their customer portal at, like the Corsair rep tells people to do here in the review section of Amazon, but their activation email never came. It's not in junk or spam, it just never came to my GMail-hosted account.

So here I am, out of a $140 supply that likely fried my $500 graphics card.

- Quiet
- Fully modular
- Nice cables
- Looks nice if you don't have a power supply shroud in your case

- See above.
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The manufacturer commented on this review(What's this?)
June 27, 2014
Hi preventDefault,

We're deeply sorry for the inconvenience. If you haven't already received an update from us, feel free to give us a call at 888-222-4346 and we'll be more than happy to assist you.

Thank you,
Corsair Customer Support
Corsair Support Email:
Corsair Support Phone Number: 888-222-4346

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Corsair RM Series 550 Watt ATX/EPS 80PLUS Gold-Certified Power Supply - CP-9020053-NA RM550
This item: Corsair RM Series 550 Watt ATX/EPS 80PLUS Gold-Certified Power Supply - CP-9020053-NA RM550
Price: $119.07
Ships from and sold by