Corsair RM750 Power Supply Review: Affordable Yet Powerful

Specifications and Part Analysis

The Corsair RM750 is the middle member of the new RM line, offering great overall performance and silent operation. It has a street price of $119.99 (£94.2) which is quite high given that the RM750x, featuring better filtering capacitors and a more top quality fan, only costs a few dollars/pounds more. The Seasonic Focus Plus 750W is more affordable than the RM750 and it also comes with Japanese caps; however the latter features much quieter operation.

We have already evaluated the RM850, and we found it to be a good product. The RM750 has 100W less capacity, and like its big brother, it uses Chinese Elite caps and a Hong Hua rifle bearing fan. The slightly more expensive RM750x comes with Japanese caps and the high-quality NR135L fan. Although those differences are notable, still the provided warranty is the same, at ten years, for both models.

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The RM750 might lose some points compared to the RM750x when it comes to build quality, but it has some aces up its sleeve. Those include increased efficiency under light loads (2% of the max-rated-output) and support for the new Modern Standby mode that the Windows 10 OS introduced. Usually, the S3 sleep state needs 7-15 seconds to turn on, depending on the system, while the Modern Standby function can do this in under five seconds.

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The Corsair RM750 is a fully modular power supply, but it doesn't have in-cable caps for some extra ripple filtering. Apparently, Corsair thought that the ripple suppression of this platform is good enough and doesn't need any enhancements. Like in every new power supply, there is a semi-passive operation which cannot be deactivated, unfortunately. Every PSU that can operate in passive mode under light loads, should provide the option for normal operation, in case it is installed with its fan facing downwards.

Specifications

Power Specifications

Cables & Connectors

There are two EPS and six PCIe connectors, which are more than enough for a 750W power supply. The number of the peripheral connectors is sufficient, but the distance between them is small at 100mm. Ideally, it should be 150mm.

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Component Analysis

We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

The table above shows the part differences in the RM750 and RM750x models. As you can see, CWT used a newer resonant controller which allows for higher efficiency under super-light loads, thanks to the burst mode operation.

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The topology on the primary side remains the same, half-bridge which is supported by an LLC resonant converter. On the secondary side, the FETs that regulate the +12V rail are different, and the same goes for the FETs that handle the minor rails.

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The soldering quality on the main PCB is good. CWT has good production lines, so we didn't expect anything less here.

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We would prefer to see the NR135L fan in the RM units, instead of the 140mm Hong Hua, because the first proved to be bullet-proof so far.

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