Corsair RM750x 750W Power Supply Review

Author:Paul Johnson

Editor:Kyle Bennett

Date: Wednesday, August 15, 2018

Corsair has been bumping up its street cred lately with PSU designs that are up to HardOCP standards. Today we have its latest 2018 version of the RM series PSU rated at 750 watts. It features Gold efficiency, a fully modular design, has a 10 year warranty, and carries with it a fully modular design, all for the price of $110.


The first thing we are going to look at with the Corsair RM750x is its packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help in many situations. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there cases where a manufacturer can include useful accessories to make installation, routing and use more efficient.

The packaging of the Corsair RM750x is very similar to a couple of recently reviewed Corsair units. Once more then, prominently featured on the front of the packaging is an picture of today's power supply along with a group of marketing points along the bottom of the box all trimmed in a very bright yellow. We also see a pair of badges that include an 80 Plus Gold seal (when we check the 80 Plus website, we see that this unit has been certified by 80 Plus for their Gold efficiency level) and a badge for a 10 year warranty. When we move to the rear of the packaging, we find a number of figures, tables, and graphs advertising about efficiency and fan noise. As usual, the values depicted on the fan noise level graph only refer to when this unit is run at the unrealistic operating temperature of 25C. So, users should be aware of that when they notice that this unit is advertised as having peak noise output of less than 22dBa. Something else to note is that this unit does indeed have a fanless operation mode. Finally on the rear, we also see that there is a power table which we have reproduced below. As we move around to the sides of the packaging we locate the connector count and that is also reproduced below.

The power information for the RM750x is as we would expect from a modern 750W for the most part and it is very similar to what we saw from the TX750M but it is not identical. This particular unit boasts a single 12v rail rated at 62.5A or up to ~100% of the unit's total capacity if necessary which is 0.5A more than the TX750M. When we look at the minor rails, we see that this unit has up to 25A available on the 3.3v and 5v rails each with a cumulative cap of 150W which is an increase of 20W over the combined capacity of the minor rails on the TX750M. This capacity on the minor rails is rather robust for modern power supplies. Paired with this output we find 4 PCIe connectors, 8 Molex connectors, and 9 SATA connectors. These connector counts are close to what we saw with the TX750M but the SATA and Molex connectors do see a slight bump in number. Overall, this arrangement of connectors is certainly enough for the majority of users looking at such a product but with this being a mainstream to lower end product in Corsair's portfolio a lot of these connectors are going to go unused in the vast majority of cases.

Once we open the packaging of the RM750x, we see the usual assortment of items including the power supply, modular cables, power cable, flash drive, mounting screws, zip-ties, user manual, and safety guide. As usual, the warranty guide isn't terribly useful in that it omits the warranty length. The user manual is 160 pages long in 10 languages. In this space it covers all members of the RMx line from 550W to 1000W. As you browse through it you find the power tables, connector counts, fan noise graph, and efficiency graph for each unit. In addition to that you get a small section on installing your PSU and that is about it. Let's move on now and see what the Build Quality looks like on this unit.