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Corsair RM Series 550W Power Supply Review

Manufacturer: Corsair

Final Thoughts and Conclusions

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The RM Series adds a new tier to Corsair’s already formidable PC power supply offering. Our RM550 test unit produced very good DC load regulation with very good efficiency (easily met 80Plus Gold certification criteria) across a full range of loads. And the unit was able to keep AC ripple and noise well under control, even at full load. The RM550 comes with a basic compliment of all-modular, flat ribbon-style cables.  The main 24-pin ATX, 4+4-pin ATX/EPS, and PCI-E connector cables are nice and long (25”-26”). And 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 (optional Corsair Link hardware required).

The MSRP for the RM Series 550W power supply is $109.99 USD and will start to be available in September, with full inventory expected by October 2013. It will be interesting to see where the pricing settles out once these units enter the market.

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Strengths:
• Very good voltage regulation
• Very good efficiency across a broad range of loads (80Plus Gold certified)
• Silent operation up to mid power levels (40~50% load)
• Corsair Link ready!
• +12V output can deliver up to 45.8A (550W)
• Two PCI-E connectors (6/8-pin)
• Active PFC with universal AC input
• Fully modular, ribbon style cables
• 5-Year warranty with lifetime support

Weaknesses:
• Fan noise becomes very noticeable at full load

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Corsair RM Series 550W Power Supply

Our thanks to Corsair for sending us the RM550 to review!

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.

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.

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