Corsair RM750x 750W 80+ Gold PSU Review

Voltage Ripple and Efficiency Testing

When reviewing new power supplies at OC3D, we use our dedicated SunMoon PSU Tester, one of the most expensive (if not the most expensive) tools in the company’s arsenal. Here we can see exactly how well a unit functions. We look at both a PSU’s efficiency and power stability. To do this, we utilise bespoke PSU testing equipment to give us an in-depth look at each power supply’s performance. This kind of data collection is not possible when using a PSU with standard PC components. 

(SunMoon PSU Tester with Corsair’s RM750 Power Supply)  

Efficiency Tests

In terms of efficiency, Corsair’s new RM750x power supply sits exactly where it should in our graphs, offering the same 80+ Gold level performance as its rivals. 

When put under our testing workloads, Corsair’s RM750x performs as intended, delivering the unit’s advertised performance levels. In a sense, this is very boring, but at least it is the good kind of boring. Corsair has promised an 80+ Gold efficiency power supply, and they have delivered. It’s nothing to complain about and nothing to celebrate either.  

  

Voltage Ripple Tests

Voltage ripple is often underlooked by consumers, being best described as the stability of specific voltages that the PSU delivers. A PSU with bad ripple will see voltages vary a lot more, which can damage components or shorten their lifespan in extreme cases. Voltage ripple stability is one of the many reasons why you should buy a high-quality power supply and avoid anything that isn’t 80+ certified.

An important thing to note here is that none of the PSUs in this graph is “bad”, even bottom of the chart units like the original Corsair RM1000 (2014) bring usable within your system without any issues. Even so, having low ripple is an important factor to consider when purchasing a new PSU. Cleaner power will help extend your PC’s components’ lifespan by placing each product’s power circuitry under less strain. Even if the RM1000 is usable in a modern system, though, we would expect all new high-end power supplies to perform better than this unit in terms of ripple. A lot has changed since the days of the RM1000. 

Corsair new RMx series units sit around the top half of our charts, offering impressively low levels of voltage fluctuation at 50% and 100% loads while 20% loads present ripple levels that are similar to the ASUS ROG Thor series. This is not a bad position to be in. Yes, this is not the best in the market, but it’s worth remembering that Corsair’s new RMx units aren’t the most expensive 80+ Gold units on the market either.

  
Does our testing line up with Corsair’s? 

With their RM750x power supply, Corsair sent us a lot of data on their new RMx range, including efficiency data for their new RMx series units. Our own testing found that our RMx series unit offered up performance data that are almost identical to Corsair’s own data. If anything, our unit is marginally more efficient than what Corsair had advertised. 

So what can we learn from this? The simple takeaway is that Corsair’s data is accurate, and that means that Corsair’s marketing is above board. Part of a reviewers job is to catch deceptive marketing, but that simply is not present here.