Ultra Power Partner 325W Additional PSU - Inside the PSU and Testing

Article Index
Ultra Power Partner 325W Additional PSU
Features and Specifications
Inside the PSU and Testing

Inside the Power Partner:

It wouldn’t be a BCCHardware PSU review if we didn’t open up the unit for a peek inside.  Four screws and a “Warranty Void if Removed” sticker is all that stands in your way if you want to open this unit.  That being said, I do not recommend that you open any PSU for any reason.  This will void your warranty and put yourself at risk of electric shock.  If you feel that you must open a PSU, think again and please don’t.

 Back Open
Back Open
 PSU Inside
PSU Inside


Ultra has made the most of the room available inside the 5.25” bay enclosure.  There is not a lot of extra room, but everything manages to fit inside and still be neat and tidy.  If this unit had to provide -12v and 3.3v power as well, it would have to be extended in order to fit everything inside.  Because it only handles a single 12v rail and a single 5v rail, everything manages to work out.

You can see in the picture above on the left that there is a voltage switch that allows you to choose between 110v and 220v.  Many full-sized ATX PSU’s do this automatically, but this must be manually selected on the Power Partner PSU.  You can see the rear fans have grills installed to prevent cables and fingers from getting whacked by the spinning fans.

Long heatsinks extend from the front to the back and seem to provide adequate cooling for this unit.  It is rated at a maximum efficiency of 73%, although we saw the power factor sit at a consistent 0.61 during load testing and 0.55 during idle testing.  This is a pretty poor PF rating as many power supplies run well over 95%.


Setup & Testing:

To test the Power Partner PSU, we offloaded an 8800GTX to the PSU as well as an optical drive and a couple of SATA hard drives from our main test system.  During non-load testing we simply hooked up the Power Partner to our EZ-PSU Tester 3 and then took reading with our Tektronix TDS-2002 Digital Oscilloscope.  For more information about our PSU Testing Methodology, please consult our updated guide here.

 5v at 5W
5v at 5W
 12v at 5W
12v at 5W


The non-load test measured a draw of 5W and while many of you may not think that non-load tests are worth reporting, we find that they are a great indicator as to load performance farther on.  In a non-load situation, we say the 5v line produce 5.15v – a very respectable number.  Ripple and noise on this line was within ATX specifications and measure 46mV.  Maximum allowable ripple and noise is supposed to be 50mV, so this didn’t pass with flying colors, but it did pass.

The 12v line reported in at 12.4v – higher than many other companies PSU’s, but right in line with what we’ve come to expect from Ultra.  The ripple and noise on this line was 68mV – and fell well below the 120mV requirement of a 12v line.

200W Load Tests:

We loaded up the system, ran some 3DMark 06 at 1600x1050 with 8x AA, 16x AF, while transferring data from one drive to another while playing a DVD movie.  This drew between 198W and 201W on the 325W rated PSU, and while it can handle more than that – it is a load that would be quite representative of real-world usage in many machines.

 5v at 200W
5v at 200W
 12v at 200W
12v at 200W


With a 200W load, we saw the Power Partner 325W PSU waver a bit.  Our 5v line remained voltage-stable with an average voltage of 5.12v, but the ripple exceeded maximum ATX specs and it topped out with a peak-to-peak average of 62mV.  Although the system remained stable throughout testing, the PSU fell outside of specifications on the 5v line.

The 12v line fared better, and in fact did not drop any voltage at all – even when we overclocked the 8800GTX graphics card attached to the PSU.  Voltage remained stable at 12.4v although you can visibly see ripple on the line.  Peak-to-peak measurements showed 72mV which is still 48mV inside the ATX specification.  To summarize visually, take a look at the charts below.

Average Voltage

Average Ripple


Final Thoughts:

The Ultra Products 325W Power Partner is a good idea, but when MSRP is $90, it really isn’t a great value.  If you’ve recently spent $100 on a 600W PSU and you need a few more Watts, for $90 this unit gives you another 12v rail and some extra voltage, but when combined with the cost of the original PSU, it really doesn’t save you any money.  Where this fits – and to be fair, the market it’s aimed at – is in a system that is sorely underpowered with an older ~450W PSU and when the system is upgraded, the original PSU cannot keep up.  The user can’t afford to drop $150+ on an 800W or greater unit and the Power Partner is a valid choice.  For $90 though it’s not necessarily a great choice, and is a little expensive per watt of performance.

When you take into account the extra cable clutter, higher case temperature and shaky 5v line, I can’t really recommend this unit to many people.  If you are on a razer thin budget this may be a last resort, but if you can save your money for another month or two and buy a larger PSU with modular cable management, you’ll be happier in the long run.





  • Easily add extra power to help an overworked PSU
  • Fits in a 5.25” bay
  • Microfilter on front prevents dust from entering PSU



  • Non-modular connectors add a lot of clutter
  • Airflow is “backward” and adds heat to the system
  • 5v line is shaky – typical of Ultra PSUs lately
  • Expensive per watt



Top Pick


I’d like to thank Ultra Products for sending on over this Power Partner PSU.  Although it has a few problems, we fully intend on keeping it around for an upcoming article for use on a system that will exceed a steady power draw of 800W.

If you have any comments or questions, please feel free to post them in the forum at the following “Comments” link.  You don’t even have to be registered to post feedback on our reviews, so head on over and drop your comments today!