Contents
- 1Introducing the Corsair HX750i
- 1.1Packaging and accessories
- 2Connectors & cabling
- 2.1Casing & cooling
- 3Input filtering
- 4Primary side
- 4.1+5 V stand-by rail
- 5Secondary side
- 5.1Build quality
- 6Load testing
- 6.1Loading +5 V SB
- 6.2Hold-up time
- 6.3Combined loading
- 6.4Combined loading ripple
- 6.5Crossloading, overloading
- 6.6Crossloading, overloading ripple
- 6.7Fan speed, temperatures and noise
- 7The Link
- 7.1The application
- 8Conclusion and evaluation
- 8.1Thanks
- 8.2Discussion
Introducing the Corsair HX750i
We have seen the Corsair RM550x unit just five months ago, and it performed very well. The RMx is based on the RMi series with only slight modifications (besides removing the Corsair Link functionality). The predecessor to the RMi is the HXi series, one of the first platforms actually designed in-house by Corsair, only manufactured by Channel Well Technology. So while the HXi is set above the RMi/RMx, it is actually older platform. There has been some improvements in the RMi series, but the HXi still has a few advantages. So lets have a look at the Corsair HX750i and talk about them.
The platform is 80 PLUS Platinum certified (@115 V) and fully-modular. It is also semi-fanless and equipped with low-noise fan so it should stay quiet almost all the time. This unit is priced at slightly over 4300 CZK (153 Eur in Germany, 235 AUD in Australia and 150 USD in USA) and covered by 7-year warranty.
The single +12V output in the HX750i is capable of delivering up to 62.5A, which in itself amounts to 750 W, so the full power output of the unit can be drawn from this rail alone. But it is possible to enable separate OCP functionality for seven +12V “rails” over the Link connection. The +3.3 and +5 V rails provide 25A each (or 150 W combined), than 3 A for stand-by supply and 0.8 A for −12 V rail. You can notice most of the numbers are the same as with the RM550x. Corsair uses basically the same DC-DC module so the higher combined power is given just by increasing the limit of input (+12V) current for these modules.
Packaging and accessories
The box of the unit is quite large. The external box is just for the marketing, made from pasteboard. There is actually a carton box inside this, that is the one actually housing the unit. Which itself is packed in a nice black sack and only then laced between two pieces of black foam to protect it from shocks. Then by the side there are the accessories.
The front side shows a picture of the unit and reminds of the most important features. The back side then holds the power distribution table, the efficiency and fan speed/noise diagram. According to it, the unit should stay silent until the output power reaches 300 W, when the fan starts spinning on low speed.
As for the extras, we have a power cord, all the modular and Link cables in another bag, then some screws, an aluminium sticker, a manual, warranty papers and ten zip ties. I think it’s worth three points this time!
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