Corsair RM750x Shift ATX v3.1 PSU Review

Epilogue

The Corsair RM750x Shift ATX v3.1 stands out with class-leading performance, topping my comparison charts. It maintains tight load regulation and excellent ripple control, and the 12V rail performs well during sudden power swings (under normal loads). Its efficiency remains high across all load levels, supported by a long hold-up time, low inrush currents, a highly efficient 5VSB rail, and extremely low standby consumption. Beyond its electrical performance, the unit operates silently—making it an ideal choice for users looking to build a silent system.

• Corsair RM1000x Shift ATX v3.1 PSU Review
• Corsair RM850x Shift ATX v3.1 PSU Review
• Corsair RM750x Shift ATX v3.1 PSU Review

The APFC converter performed well at 115V, but not at 230V. Moreover, the 12V rail’s transient response under high loads (ATX v3.1 test scenarios) could use improvement, and, above all, I noticed issues with the protection features, specifically the settings of the minor rails. Besides sky-high OCP triggering points compared to the nominal values, I also found that the standard- and high-temperature OCP triggering points are almost identical, which affects their effectiveness. The PSU is stressed much more at high operating temperatures; hence, there needs to be a significant difference in the respective OCP (and OPP) triggering points.

Lastly, I want to emphasize that you will probably notice a high difference in my inrush current measurements compared to previous reviews. This is because I completely changed the methodology and the measuring equipment. I used to switch the PSU on and off via its power switch, which affected the respective measurements. I do it now using an AC source, set to supply power starting with a 90-degree phase.

Overall, the Corsair RM750x Shift ATX v3.1 delivers excellent performance and solid build quality. If the protection thresholds on the minor rails were configured correctly, it would easily earn a recommendation—perhaps even an Editor’s Choice on a good day. However, I’ve committed to never awarding badges to power supplies that don’t implement their protection features correctly. Some people in the industry may dislike this stance, but it’s the only way I can push for higher standards in this critical area.

Before investing in a new power supply, read my article on the Best ATX v3.x PSUs to compare all alternative PSU offerings. You help me a lot by using my affiliate links, which don’t increase the price of the product. I receive a commission from Amazon every time you do it, which can make a significant difference for me, especially now that I am working independently, exclusively for my media, rather than for someone else.