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As mainstream power supplies shift towards the ATX 3.1 standard, the pace of change is accelerating. Most vendors already offer at least one ATX 3.1 unit in their lineups. Thanks to the minimal changes in the revised standard, PSU vendors can tweak their existing ATX 3.0 designs for a quick roll-out of updated power supplies. The inflection point for ATX 3.1 is fast approaching as more designs get updated and hit retail shelves.
Today, we’re examining our first ATX 3.1-compliant PSU from Corsair, a prolific and high-profile power supply vendor. Their revised RMe line targets the mainstream gaming market, crucial for ATX 3.1 support and safety for video cards. The RM750e model is the smallest in the lineup, ranging from 750 Watts to 1200 Watts.
The RM750e meets the demands of contemporary gaming systems with a balance of features, performance, and cost. It is an 80Plus Gold certified unit with modular cables and PCIe 5.1/ATX 3.1 certification, offering a single 600W 12V-2×6 connector. We will explore its specifications, construction, and performance to determine its market standing.
| Corsair RM750e (CP-9020262-NA) Power specifications (Rated @ 50 °C) | |||||
| RAIL | +3.3V | +5V | +12V | +5Vsb | -12V |
| MAX OUTPUT | 20A | 20A | 62.5A | 3A | 0A |
| 110W | 750W | 15W | 0W | ||
| TOTAL | 750W | ||||
| 80PLUS RATING | Gold | ||||
| AC INPUT | 100 – 240 VAC, 50 – 60 Hz | ||||
| MSRP | $95 | ||||
Packaging and Bundle
The Corsair RM750e 750W PSU is packaged in a typical cardboard box featuring Corsair’s yellow and black color theme, with an image of the PSU on the front. Though labeled as ATX 3.0, Corsair has confirmed that the unit is ATX 3.1 compliant, and the packaging has not been updated yet. Inside, the PSU is protected by a nylon bag and dense packaging foam, ensuring it arrives safely.
The bundle includes mounting screws, an AC power cable, and a few basic cable ties, covering the essentials for installation.
This PSU features an all-black cable design, with the ATX 24-pin connector sleeved and the remaining cables in a flat, ribbon-like style. The 600W 12V-2×6 connector is perhaps the highlight here, as it connects two 8-pin PCIe connectors to the PSU side.
| Corsair RM750e | ||
| Connector type | Hardwired | Modular |
| ATX 24 Pin | – | 1 |
| EPS 4+4 Pin | – | 2 |
| EPS 8 Pin | – | – |
| 12V-2×6 | – | 1 |
| PCI-E 8 Pin | – | 3 |
| SATA | – | 7 |
| Molex | – | 4 |
| Floppy | – | – |
The Corsair RM750e 750W ATX 3.1 PSU
External Appearance
The Corsair RM750e 750W PSU adheres to the ATX design guide with a chassis length of 140 mm, ensuring compatibility with any standard ATX-compliant tower PC case. The only direct downside here is the usual one, which is that the body length limits the cooling fan size to 120 mm.
The PSU features a smooth satin black finish with geometric design elements such as chamfered edges and includes large decorative stickers that cover most of the left and right sides. The top side of the unit hosts a sticker with the electrical specifications and certifications. At the bottom side of the PSU, we find the fan finger guard integrated into the chassis itself, featuring a geometric triangular cutout pattern.
On the front side, the PSU features just the standard on/off switch and AC cable receptacle. The rear side houses the modular cable connectors, which are labeled with a basic white legend. The number of connectors limits the number of cables that can be attached simultaneously, as there are only four PCIe/CPU connectors and seven cables to choose from (two CPU 12V, three PCI Express 8-pin, and the 12V-2×6 cable requires two connectors). A small white imprint of the company logo is located at the top left corner.
Internal Design
The Corsair RM750e 750W PSU is equipped with a Hong Hua 1225H12F-Z 120 mm fan, utilizing a rifle-bearing (sleeve) engine. This type of fan is known for its good balance of reliability, noise levels, and cost. It has a high maximum speed of 2200 RPM, which should be more than adequate for a 750W unit.
The OEM for the RM750e is HEC/Compucase, a well-established company with extensive experience in the power electronics industry since 1979. Although traditionally focused on cost-effective solutions, HEC/Compucase has recently developed platforms for mid-range and high-performance PC PSUs.
The RM750e’s electrical design features established topologies aimed at ensuring reliability. The input stage includes a robust filtering setup with four Y capacitors, three X capacitors, and two filtering inductors. The two rectifying bridges share the main heatsink with the APFC components, which are two Infineon 60R120P7 APFC MOSFETs and a diode. A typical inductor paired with a Teapo 470 μF capacitor are the passive components of the APFC circuitry.
In the primary inversion stage, the PSU employs a typical half-bridge LLC topology using two Infineon 60R120P7 MOSFETs mounted on a dedicated heatsink. The secondary stage features a synchronous rectification circuit on a vertical daughterboard for the primary 12V line, with additional DC-to-DC circuits on small vertical daughterboards generating the 3.3V and 5V lines. The secondary side MOSFETs are hidden beneath a metallic slab that serves as a basic heatsink. Secondary side capacitors are primarily supplied by Teapo, with a few Nippon Chemi-Con capacitors included.
