The latest version of Corsair's RM750x units, coming in 2021, succeeds in improving on an already excellent product: Corsair's RMx line is the best on the PSU market, combining high performance with a reasonable price, and the RM750x is clear evidence of that. Competition is stiff, but Corsair R&D manager Jon Gerow (aka Jonnyguru, the famous PSU reviewer) and his team of engineers have succeeded in creating products that set the bar even higher.

There is no mistaking the RMx units, which is why we chose the RM750x for the best gaming PSU in the 750W category (opens in new tab).

The new Corsair RMx (2021) line consists of five models ranging in capacity from 550W to 1000W, with the main differences from the previous models being.

Fan upgrades are a very welcome feature. It provides increased reliability in harsh conditions where most rifled fans and fluid dynamic bearing fans have long-term problems.

The build quality, available only from Corsair, is also outstanding on this CWT platform. The caps on both the primary and secondary sides are made in Japan, and the FETs, along with the magnetic levitation fans, will have no problem outlasting the 10-year warranty.

The 12V rail can supply up to 750W, and the minor rails are strong with a total maximum of 150W.

With two EPS and four PCIe connectors on two cables, this PSU can handle powerful gaming systems. All cables are long enough so that even large enclosures are not a problem. The only problem is the short distances between the peripheral connectors, especially the 4-pin Molex connector.

The voltage on the 12V rail rises at light loads, affecting load regulation. Similar things happen to other rails. Nevertheless, under real-world conditions, the load regulation of all rails is much stricter than shown in the graph. [On the other hand, ripple suppression is revolutionary. The combination of the platform design and the caps in the cables is responsible for these excellent results.

Hold-up times are very long, as are hold-up times for the power OK signal, and inrush currents are low at both voltage inputs.

Efficiency is at a good level at normal loads and very high at light and very light loads, but the efficiency of the 5VSB rail does not lag behind compared to the main PSU circuit. Nonetheless, vampire power is low.

There is room for efficiency improvement, especially at high loads.

Transient response is good at minor rails, but there is room for improvement at 12V where it matters most.

The OCP trigger points for 12V and OPP are set correctly under hot and cold conditions. However, minor rails, especially at 3.3V, which is only lightly used in today's systems, do not require such high OCP trigger points.

However, when it comes to relative performance, the RM750x (2021) easily leads in this category. it is worth noting that the RM750x is not a noisy unit, but the difference from the previous model is quite significant. the ML fan contributes to the increased noise output.

This is the first time we have seen ML fans in a PSU, which is great. Although the output noise is increased compared to previous models with rifled bearing fans, we still fully support Corsair's decision to use this type of fan. Cooling fans are an important part of every PSU and greatly affect its reliability, so it is important to use the best fan possible. If a fan fails, everything else will fail in a short period of time and there is even a risk of fire if over-temperature protection is lacking. This is why cooling fans and filtering caps are two of the most important components of a power supply.

More generally, the Corsair RM750x (2021) has a performance lead over the competition thanks to its superior platform and top-notch build quality. However, if we had to pick an alternative in case this is not near you, it would be XPG's Core Reactor 750W.