Corsair HX750i Power Supply Review
by E. Fylladitakis on January 14, 2015 10:00 AM EST- Posted in
- Cases/Cooling/PSUs
- Corsair
- PSUs
- HXi Series
Cold Test Results
For testing PSUs, we use high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox, and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs – 2014 Pipeline post.
Honoring its 80 Plus Platinum certification, the Corsair HX750i displays outstanding performance at room temperature. The peak efficiency is 94.3% at 50% load and the average within the nominal load range (20% to 100% of the unit's capacity) is an astonishing 92.9%. The HX750i performs well under low loads as well, with the efficiency plummeting only when the load is less than 50 Watts.
The very high efficiency of the HX750i combined with the hybrid fan design allows the HX750i to operate with its fan turned off with a load up to about 300 Watts. After that, the fan will start but the power supply will remain essentially quiet with a load up to 600 Watts. Only when the load exceeds that point does the fan becomes clearly audible, yet it never reaches the point where we would consider it loud -- especially if it's housed in a closed case.
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EzioAs - Wednesday, January 14, 2015 - link
Isn't the fan FDB, not rifle bearing?Galcobar - Wednesday, January 14, 2015 - link
It is FDB according to the jonnyGURU review in August.While Anandtech has a well-deserved reputation for quality reviews, with about 300 reviewed power supplies since 2007 I'll trust OklahomaWolf.
djscrew - Thursday, January 15, 2015 - link
Yep, OklahomaWolf or nothing else when it comes to PSU reviews. Bobnova isn't half bad either.djscrew - Thursday, January 15, 2015 - link
That being said, Corsair usually ranks from excellent to near perfect for their higher end PSUs like this one.tabascosauz - Thursday, January 15, 2015 - link
TPU is quite good as well. I'd say OklahomaWolf and crmaris are two of the top PSU reviewers out there.Achaios - Thursday, January 15, 2015 - link
So, let me get this straight: a. B/c Johnny Guru tested a similar PSU that had an FDB fan and not rifle bearing fan, this review is bad? b. Even if the fan is FDB (wtf is that anyway) and not rifle bearing, how exactly is this the best realization that ever dawned on humanity after penicillin?I really don't want some of whatever you are smokin'.
Galcobar - Thursday, January 15, 2015 - link
Because jonnyGURU tested this exact power supply model - and it's 1000W brother - and determined that this had an FDB fan, this review is incorrect in at least one simple area.You'll note that nobody in the replies -- other than you -- said this review is bad, or that not being able to identify a fluid-dynamic bearing over a rifle bearing is important in the history of humanity.
The comments offered opinions on what reviewers do such a good job that they set the standard by which all other PSU reviews are measured. If you have an alternative with equal or greater demonstrated competence, I'm sure the people reading this power supply review would love to have another trustworthy reviewer to consult.
Galcobar - Thursday, January 15, 2015 - link
Bah, typos. Really wish we had an edit button. It's/Its, etc.Lukeroge - Thursday, January 15, 2015 - link
It looks very similar to the rifle bearing in the RM series, but it's a higher-end FDB bearing like the AX1500i.jonnyGURU - Friday, January 16, 2015 - link
It's an FDB fan. NOT a rifle bearing. This is stated on Corsair's website and the reviewer's guide included with the press kit. Also, the part number on the fan is different than the rifle bearing used in the RM Series.