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CoolerMaster Power Supply RS550-AMAAB1-US G550M 550W ATX Active PFC 80PLUS BRONZE Haswell 12cm Fan Modular

Ships from United States. Most customers receive within 2-10 days.

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  • 80 Plus Bronze Certified with up to 85% efficiency
  • Engineered to support 6th generation & Skylake C6/C7 sleep states
  • Modular cable design saves space

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Cooler Master's GM Series power supplies delivers great value for any budget conscious builder. With a compact profile, semi-modular cables for easy maintenance, making it ideal for space-limited mini-ITX. Built with high quality components and high 80 PLUS Bronze efficiency, provide great longevity and reliability for your next system build.

HIGHLIGHT FEATURES

LESS CABLES. LESS CLUTTER

Features a design that allows you to only connect cables that are needed for a clean and tidy system with excellent airflow.

QUALITY DESIGN

High quality components provide greater longevity, reliability and efficiency with reduced ripple and electrical instabilities.

COMPACT POWER

At only 140mm (5.5 inches) long, GM is quite compact. It's perfect for any system; especially space-limited mini-ITX builds.

80 PLUS SAVINGS

80 PLUS Bronze certification for great savings on your energy bill with up to 85% efficiency.

ADDITIONAL PRODUCT FEATURES

Honeycomb vent allows excellent airflow
Unique 3D circuit design reduces unnecessary cabling for improved heat dissipation and lowered crosstalk
Custom DC-DC module design for increased voltage stability and efficiency

POWER CHART

Powerful single +12V rail provides superior load balancing and graphics card compatibility.

COVERAGE

Parts, product replacement, and free technical support.

WHICH PSU IS RIGHT FOR YOU?

 

GM Series

VSM Series

Dimensions (L x W x H) 5.9 x 5.5 x 3.4 in
150 x 140 x 86 mm
5.9 x 5.5 x 3.4 in
150 x 140 x 86 mm
Cabling Modular Modular
Available Wattages 550/650/750 550/650/750
80 PLUS Certification Bronze Gold
Efficiency (Typical Load) Up to 85% Up to 90%

Learn more about the Cooler Master G550M (RS550-AMAAB1-US)

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Sorry, not for a compact ITX build

Pros: It is a compact unit and the modular design makes it more flexible. The big 120mm fan is pretty quiet too

Cons: The cables that are attached are wrapped in some sort of stiff plastic mesh that makes them really stiff. One of the images shows the power supply in the very case I used for an ITX build, but it doesn't show the thick, stiff cables bent into the case. In fact, if I had needed an optical drive, I wouldn't have had place to stuff them.
The modular cables, too, are some stiff, flat plastic material which is hard to bend. The drive connectors at the end are angled, but in my case (again, the one in the illustration) the drives are mounted flat against the wall and floor of the case and the connectors are therefore angled the wrong way around, making them useless for attaching to the drives.

Other Thoughts: Electronically, this is a great little power supply. Ergonomically, it is a failure for a compact build. I'm sure it would be just great in a full tower case, though

1 out of 1 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
1/ 5
Ehhhhhhhh, defective

Pros: Worked well

Cons: Would not shut down. Would power down and 3 seconds later start right back up.

Other Thoughts: Neweggs return policy works !

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Work great

Pros: Well laid out, plenty of room bottom power supply, room for radiator, great price, well made.

Cons: None

Did you find this review helpful?
Ownership: 1 day to 1 week
Verified Owner
5/ 5
Not everyone needs 750w PS

Pros: So far it has worked really well for my setup 6th Gen i7 6700k 4Ghz, Evga 980GTX 4GB Video, 240mm closed loop watercooling, Asus Micro ATX Z-170, Corsair DDR4-3000 16Gb. No problem supplying all voltages during heavy gaming.

Cons: None.

Other Thoughts: Coolermaster has always delivered. There are still computers I bult 7 years ago for co-workers running Coolermaster PSU's

3 out of 3 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
4/ 5
PSU Fan Loud

Pros: Handled everything smoothly and provided enough power to power the overclocked i5-4690k @4.6GHz and a 960. Also liked how the cables were sleeved, and would probably buy from them again.

Cons: Only problem is that the psu fan was loud and made a weird whirling sound, so had to fix it by disassembling the psu and the fan. To move the blades a bit outwards to avoid the noise from happening. Another thing that bothers me is the CPU power cable, had to kind of pull the cable a bit and had a hard time plugging it into the H440 case that I had.

Other Thoughts: Overall everything went well, except just keep in mind that the rebate does take a while to process. Had to wait for it to be verified and mailed to my house over 2 months. And just received it today.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
4/ 5
Great Power Supply

Pros: Has sleeved cables, is modular, includes plenty of extra cables. Works great. I have mine running a i5-4690k barely over locked and a r9 380. All cables seem very secure would definitely buy again.

Cons: My only con is that the cpu power cable was not long enough to reach from behind my board so I had to drape it in front of my board. Not a biggie but still would like to have the extra airflow. I'm sure someone will probably say just buy a longer cpu power cable, but it should be long enough as is. Btw I have a HAF 912 case.

7 out of 7 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Good Power supply

Pros: Compact, Modular, plenty of power for a modest build

Cons: None so far

Other Thoughts: Its a power supply so there isn't much to say they either work of they don't. Provides lots of connections for devices. Great for small form factor builds or HTPC's.

2 out of 2 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Outstanding duing build

Pros: During building of current computer, No problem

Cons: None

2 out of 3 people found this review helpful. Did you?
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