Tuniq Potency 750W PSU - Testing the 750W Tuniq PSU

Article Index
Tuniq Potency 750W PSU
Info, Features and Specifications
Inside the PSU and Test Setup
Testing the 750W Tuniq PSU

Testing - 185W & 478W: 

We initially plugged the PSU into an EZ PSU Tester 3 in order to power it on for our "idle" measurements.  As noticed below, the voltage rails were fairly stable with no load, but these aren't necessarily indicative of overall load performance.  According to our Kill-a-Watt, the power draw was 7W.  We thought these results would be interesting to include and compare with other power supplies to see how they manage a non-load situation, and how much power the PSU itself will draw.  

Just before we jump into testing it would be helpful to know what each of the +12v rails do.  As near as we can tell, one +12v rail handles the 24-pin connector, another handles the 4-pin/8-pin, Molex and SATA connections, while the other two +12v rails are assigned to each of the PCIe leads.  While we don't have any documentation to back this up, we noticed that these four groups followed the same ripple, noise and average voltage readings.


This test system has undergone an upgrade for this PSU test and we wondered at first if we could push the PSU with a Core i7 920 overclocked to 4.2GHz along with a couple of Radeon 4850 graphics cards in Crossfire.  Initially, we could exceed much more than 600W, but then we found out that Furmark can really make the system scream for mercy and we managed to combine this with PMCore running a 100,000 test on all eight threads.  This brought power consumption up to 736+ Watts and we even managed to see 760W peak draw at one point.  I think it's safe to say that this PSU is being pushed pretty hard.

 12v4 Load 3v Load
3v Load


All of the rails managed to stay above their rated level and the lowest +12v rail dipped to a mere 12.3 even with a 736W load. The 3.3v line dropped to 3.36v, while the 5v line stayed rock solid and never fluctuated more than 0.01v.  Click the chart below for full details.

Ave Voltage

While the +12v rails looks high at 12.4v, keep in mind that they are only about 3% high and are well within specifications.  From top to bottom the voltage on any of the 12v rails never moves more than 0.1v - less that 1%.  It's a very solid showing at our tested loads.  The 5v and 3.3v lines are equally solid and never fluctuate more than 1%.  The voltages on all of the rails are a little high, but remains rock solid.  What may be a bit concerning is the fluctuation of the -12v rail.  It goes from a nice manageable -12.2 at idle to -13.2 at 736W load.  This is on the edge of the 10% tolerance.

Tuniq doesn't provide any additional information as to the ripple and noise specifications on this PSU so we assume they plan to follow standard ATX specs.  Standard ATX specifications state that the 12v lines must not exceed 120mv while the 3.3v and 5v lines must not exceed 50mv.  With that in mind let's take a look at the noise and ripple measurement.

  Ripple & Noise

Three of the 12v rails stay within ATX spec according to our strict testing methods, although the +12v4 line hits 126mV average noise at a 736W load.  This is powering one of our HD4850 cards but has remained "noisier" all through the tests.  The 3.3v, 5v and -12v lines stay with specification in terms of ripple and noise although the -12v line shows a lot of noise all through the tests.  The 3.3v and 5v lines on this PSU show some of the best performance of any PSU we've tested before - and that's something we didn't expect from Tuniq.  This 750W PSU really seems like it is up to the task - except for that darn 12v4 line...


The Tuniq Potency 750W PSU is a nice step up from the first Tuniq Potency (550W) unit we looked at a few months ago.  It pleasantly surprised us with its ability to pump out the wattage and keep our test system running solid at 736W.  While it's not for extreme systems, it can certainly power many decent gaming rigs without breaking a sweat.  Its four 12v rails provide adequate power, and although the 12v4 rail appears a little noisy under a full load, it didn't affect system stability.  What irritates me though is that once again Tuniq claims the PSU is SLI Certified on their website, says SLI Ready on the box, and no SLI information is available at the SLIZone.  I would love it if Tuniq would clear up the confusion and either quit stating SLI Certified or make sure they get listed at the SLI Zone.  


  • Standard ATX Form Factor
  • Very Quiet PSU
  • 2x 6-pin and 2x 6-pin/8-pin PCIe connectors
  • Provides ample power for most gaming system
  • Fan stays powered on 2 minutes after system shutdown to cool hot PSU components



  • 12v4 rail runs a little wild on the noise/ripple test
  • -12v rail gets "wide" at -13.2v at high load
  • Not sure if it's SLI Certified or if Tuniq has just added a sticker to the box for fun.



Tuniq has once again delivered a great value PSU as this unit can be found for under $120 online.  For that price, it's certainly a good value and provides enough power for many systems.  At 750W, it's going to do a good job in many PCs without breaking the bank.

I'd like to thank Tuniq for sending this unit our way for the review.  If you have any questions, comments or general feedback, please feel free to post it in the forum at the "Comments" link below.