Corsair HX750i: the basis for RMi series

Conclusion and evaluation

The Corsair HX750i passed the combined and crossload testing in accordance with the ATX specification, so according to my evaluation methodology, it is deserving of an evaluation. The voltage regulation and ripple suppression is quite nice, it is good to see a high-end-priced unit which can handle itself within my high-end requirements after a while. As could be expected, it is tiny bit worse than the RMx (as it is newer, enhanced platform based on HXi), but it is not that much worse, still really nice results. The efficiency is slightly lower than what you would expect, though it is still closer to 80 PLUS Platinum this time (compared to previous units).

The semi-fanless operation works fine and if you keep the unit cool, it should never be noisy. But at close to full power, it will still be audible: if your target is very silent build, keep the load about 200W under the full output. Otherwise there is nothing really to say: fully-modular unit with quality components and 7-year warranty (though some competitive products offer even more). As long you keep an eye on power distribution (=no crazy crypto miners sucking 20A through single 6-pin connector) because of somewhat cheapish cabling to my taste, you will be good.

I would like to mention again that I do not really like this practice of selling 7-rail unit promoted as single-rail anywhere you look at. Yes, it can be turned off for HX750i through the Link utility, but everything about this unit makes you think the single-rail mode is active as default, while the opposite is true. It must be said strongly such misleading behaviour is clearly wrong. Some people may even see that as deliberate deception (as single-rail units sell better to some customers), especially in the land of lawsuits (remember for example Liebeck v. McDonald’s Restaurants). And the Link software utility itself is even worse. It has some major problems with OS support, SW pre-requsities and possibly even the website. But nobody tells you anywhere in advance they might just not support your OS, you only learn after you buy it and it does not work.

The value of the Corsair HX750i as a high-end unit is as follows:

• component/technology quality: 6 p. (− for thin wires, − for lack of golden-plating, − for unsafe OCP, + for molex unplugging clips, + for working OTP, + for non-working fan protection)
• built quality: 4 p. (− for messy soldering, − for semi-loose piece of electrode)
• voltage regulation: 21 p. (+ for combined loading, + for crossloading)
• ripple: 13 p. (+ for combined loading, + for crossloading)
• efficiency: 7 p. (− for lower efficiency)
• hold-up time: 11 p. (+ for longer voltage hold-up time)
• others: 19 p. (− for misleading OCP settings, + for modular cabling, + for extra equipment, + for Link functionality, + for semi-fanless operation, + for longer warranty)

The score is quite high, but there are still some things I do not really like in case of such highly-priced units. But I think these results still qualify for our Silver award!

Assuming the cost is 4300 CZK, then the price per value ratio would be 100×81/4300 = 1.88. So after eight high-end units (which passed), we can see that the Corsair HX750i is second in value. However, considering the price per value ratio, the RM550x also from Corsair is almost twice as good for its price!

Pros	+ modular cabling + semi-fanless operation + Link functionality and some extra equipment + working OTP and fan protection + nice voltage regulation + very good ripple suppression + long warranty + OK efficiency + OK build quality, high-quality components + good hold-up time
Cons	− unsafe OCP limit on some rails − cheapish cabling − misleading +12V rail configuration − Link software problems
Be aware of…	/?\

Thanks

I thank the Corsair company for providing the Corsair HX750i unit.

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