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Corsair RM550x Power Supply Review

The lowest-capacity unit Corsair's RMx line outputs up to 550W and is 80 PLUS Gold-certified. It features fully modular cabling, offers great performance and is nearly silent throughout its operating range, too.

Performance, Performance Per Dollar, Noise and Efficiency Ratings

Performance Rating

The following graph shows the total performance rating of the PSU, comparing it to other units we have tested. To be more specific, the tested unit is shown as 100 percent, and every other unit's performance is shown relative to it.

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Corsair's performance is very good. Only Seasonic's excellent SS-5220FL, which costs much more, manages to take a clear lead. The Platinum-rated Super Flower unit surpasses the RM550x mostly because of its higher efficiency. Most notably, Corsair successfully delivers a power supply in this category that beats the previously-dominant 550 G2.

Performance Per Dollar

The following chart may be the most interesting to many of you because it depicts the unit's performance per dollar score. We looked up the current price of each PSU on popular online shops and used those figures and all relative performance numbers to calculate the index. If the specific model wasn't available in the United States, we searched for it in popular European Union shops, converting the listed price to USD (without VAT). Note that all of the numbers in the following graph are normalized by the rated power of each PSU.

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The RM550x's price isn't great, so its performance per dollar suffers. Corsair should drop this product's price by $10 or $15 if it wants to compete more aggressively.

Noise Rating

The graph below depicts the cooling fan's average noise over the PSU's entire operating range, with an ambient temperature between 28 and 30 °C (82 to 86 °F).

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This is hands-down the quietest 550W PSU we've ever evaluated.

Efficiency Rating

The following graph shows the average efficiency of the PSU throughout its entire operating range, with an ambient temperature between 28 °C and 30 °C.

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In our normal efficiency tests, the RM550x scored high. But in the cross-load tests, where thousands of load combinations are dialed in, the unit falls behind its competition. The difference isn't significant though, and the fact is that the small RMx model is still considered highly efficient.

  • Dark Lord of Tech
    I just wish they would get the price down , these are a great lineup \ RX.
    Reply
  • basroil
    From the performance it seems like CWT is finally something to consider... It's showing Leadex Gold/Seasonic levels of performance.
    Reply
  • Dark Lord of Tech
    I love the RMX and RMI series , price just keeps me away from the purchase , very very solid.

    Knock a little off the price and these would fly out of warehouses.
    Reply
  • William Henrickson
    They were on sale when new. I snagged an RM750i for $105 -w- shipping
    Reply
  • Dark Lord of Tech
    Yeah the 550w should be about 79.99 to 89.99 , no rebates.
    Then I would grab a few.
    Reply
  • JQB45
    Yeah the 550w should be about 79.99 to 89.99 , no rebates.
    Then I would grab a few.

    Corsair RMx 550W 80+ Gold Certified Fully-Modular ATX Power Supply
    http://pcpartpicker.com/part/corsair-power-supply-cp9020090na$79.99

    $89.99 for the 650W version.

    UPDATE:

    Sorry thats with mail in rebates...
    Reply
  • Dark Lord of Tech
    I don't do rebates , takes to long , and maybe you get it maybe you don't , I'll wait for a newegg drop.
    Reply
  • Nintendork
    We really need more platinum/titanium PSU's at 300-500w. Most PC's stays near idle and with the efficiency focused gpu's/cpu's they rarely exceed 100w unless you tax them.
    Reply
  • turkey3_scratch
    Plus companies often don't even send you the rebates, sometimes they just say it was too late or some other bull crap like that. I agree with Blackbird. I've been waiting for a review of the 550 RMx, and what I get out of this review is that it trades blows with the 550 G2 that saying one or the other is better is just silly and extremely nit-picky. They are both incredible. Both offer a 7 year warranty, as only higher-wattage G2s offer the 10 year warranty. They are just so close, that when it comes to picking the better one, the cheaper one is better, and the G2 is cheaper.

    I've actually quit including rebates in my pcpartpicker lists. They are a pain and I don't think they reflect the true cost of an item.
    Reply
  • turkey3_scratch
    17653281 said:
    We really need more platinum/titanium PSU's at 300-500w. Most PC's stays near idle and with the efficiency focused gpu's/cpu's they rarely exceed 100w unless you tax them.

    I wish so, but unfortunately if this were to happen they would end up priced the same as any Platinnum/Titanium 650W unit. It's just the way it works. Quality low-wattage models are priced almost the same as the higher-wattage models. I would like to see something like a Titanium 250W model come out from Seasonic. Something like $40, fully modular. Will never happen, though.
    Reply