Ultra X2 750W Titanium Modular PSU - Testing the 750W Titanium PSU

Article Index
Ultra X2 750W Titanium Modular PSU
Closer Look at the X2 750W PSU
Testing the 750W Titanium PSU
Full Load Testing and Final Thoughts

Testing the X2:

In the past, we've prided ourselves on real-world testing.  For graphics cards, CPUs and memory, what matters is what takes place in real applications and games.  We also held that philosophy for PSU testing, but after a while, we realized that there is more to a PSU that being able to run a machine stable over a few weeks or months.  In reality, if there is a lot of ripple, this can damage sensitive traces on your $700 graphics card or $1300 CPU.  A multi-meter alone is not good enough to check PSU voltage stability.  It's for this reason that we've updated our PSU testbed, and will continue to improve the detail and quality of our PSU reviews.  That being said, we will still be testing the PSU in a system and will be including stress tests from real components in the real world.

We recently purchased a Tektronix TDS2002 60MHz Dual Channel scope and it has already become invaluable around the shop here at BCCHardware headquarters.  I've used it to troubleshoot everything from PSU's to Radars, and we are using it today to check the stability of the X2 750W Titanium unit from Ultra Products.


Test System:


14W (No Load) Tests:

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 14W.  It's also noteworthy to mention that the Power Factor at this non-load situation is a mere 0.46.  We have started to include these non-load results and compare with other power supplies to see how they manage a non-load situation, and how much power the PSU itself will draw.

-12v at 14w
-12v at 14w
 3.3v at 14w
3.3v at 14w


 5v at 14w
5v at 14w
 12v1 at 14w
12v1 at 14w

 

Voltages all look very good and are slightly above their actual rated values, but well within specification.  We've seen some PSUs overvolted as much at 0.7v on a 12v rail, but the X2 looks much closer to where it should be.  Ripple and noise is a little high on both 3.3v and 5v lines, but that isn't indicative of regulation when a load is applied so we'll let it slide - for now.


300W Tests:

Next we fired up our test rig and overclocked the CPU to a modest 3.0GHz and left it idling in Windows.  This produced a fairly static 300W load.  At this point we saw the Power Factor measure 0.68 on this PSU.  Keep in mind that higher is better as it indicates a more efficient PSU.  Previously tested Zalman PSU's measure over .90 in terms of Power Factor, so the X2 is a little weak in this area.

 -12v at 300w
-12v at 300w
 3.3v at 300w
3.3v at 300w

 

5v at 300w
5v at 300w
12v rails at 300w
12v rails at 300w

 

The 300W load tests tell an interesting story.  When running this load, we see the X2 at its best.  The -12v and +12v rails are all very good at this and are well within their maximum allowable ripple and noise measurement.  The 12v1 rail is the quietest at 48mV - well under the 120mV specification.  The other +12v rail is 54mV as is the -12v rail.  The 3.3v is already faltering as it falls outside the 50mV rating.  It measures 52mV.  The 5v rails squeaks in at 46mV.  Note that both 12v rails are pictured in the same image.  12v1 is shown as yellow and 12v2 is shown as blue.

On the last page we'll wrap up testing with our maximum load tests and draw some final conclusions.