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Pros, Cons And Final Verdict
For those of you who think 140 bucks is way too much to pay for a 750 W PSU, Corsair lowered the price a bit with the RM750x, which costs $10 less. If you ask us, we would happily pay the small premium for Corsair Link compatibility and the fluid dynamic bearing fan, which will last much longer than the rifle-bearing one that the RM750x uses. Corsair would be wise to enlarge the price difference between the RM750i and the RM750x if it wants to sell more of the pricier unit. We think a price difference of $20 would be ideal, but we encourage the company to make it even larger by dropping the price of the RM750x, not by increasing the price of the RM750i. The RMx models use the same platform as the RMi units, so their performance and reliability are very good.
The RM750x unit we evaluated in this review achieved decent load regulation at +12V and quite tight regulation on all of the other rails. In addition, its efficiency readings were solid, even under very high operating temperatures, and ripple suppression was amazing throughout all of the load ranges. Another important feature of this platform is its silent operation, thanks to the passive operation at light and moderate loads, and the relaxed fan profile. This unit would be ideal for systems where silent operation is critical. However, it would have been nice if Corsair had added the option to select between normal operation and semipassive operation. A small switch could offer this capability and could also play the role of the fan-test button, which is missing in the RMx units. We believe that in PSUs that utilize a semipassive operation, there must be an option to check if the fan is working normally, meaning that it is spinning.
To wrap up, the main competitor of the RM750x is the RM750i, which, for only $10 more, offers digital monitoring capabilities, allows the control of its cooling fan and has multiple +12V rails that can be combined into one. Plus, all of those additional features are possible through the Corsair Link software. On top of that, the RM750i is equipped with an FDB fan and a fan-test button. We believe that even if you don't care about the digital interface of the RMi, the FDB fan should intrigue you.
With the current pricing scheme, the RM750x faces strong competition, but this could easily change if Corsair decides to bring down the price to $120 or less. Finally, like the RM750i, the RMx model comes with only a single EPS connector. Considering most high-end mainboards need at least one EPS connector and a four-pin ATX one, Corsair should equip these units with a couple of EPS connectors to rectify this downside.
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Aris Mpitziopoulos is a Contributing Editor for Tom's Hardware, covering Power Supplies.
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