Enermax MODU87+ 700w PSU Review
For those of you familiar with the layout of the Overclock3D PSU reviews, you probably will have turned to this page expecting a massive table of results followed by a load of screenshots from our Oscilloscope. Feedback has told us that most (not all) of you couldn't make head nor tail of this data and instead just turned to the conclusion for our final thoughts. So today we're going to test the water with some of those fancy things called graphs. Don't go getting worried though, all of our testing is still conducted on professional SunMoon and Analogic DC load equipment at Sahara-like temperatures of 50°C. And if you still crave the full tabular breakdown of our results these can be found over on the next page.
However, before we get started discussing these spangly new graphs, there are some some points worthy of note: The highest and lowest values on the Y-axis (voltage) represent the maximum and minimum voltages allowed by ATX specifications.The thick white vertical line indicates the 'ideal' voltage. The green area indicates 'normal' usage scenarios. The orange area indicates cross-load tests highly unlikely to be encountered in the real world, and finally the red area indicates the 'Max Load' test designed to push a PSU to the absolute edge before it starts spitting fire like a Dragon after ordering Phal from his local Tandoori house.
Starting with both the +3.3v and +5.0v rails we can see that they share very similar characteristics when placed under load. This is of little surprise really as both rails draw their power from the 12v transformer inside the MODU87+ and use almost identical VRM's to step down the output to their required voltages.
Enermax have really got the unit tuned to perfection with each of the two rails hitting its ideal voltage during a ~50% load in Test2. By Test4 the voltages have taken a dip to 3.23v and 4.88v, which is a little lower than some PSU connoisseurs might be happy with, but is still well inside the ±5% requirements for meeting ATX spec.
Cross load test TX1 is all about running the +3.3v and +5v rails at their maximum output with little/no load on the +12v rail, and here they both perform exceptionally. Only in the max load test (TMax) does the MODU87+ really drop the ball with voltages bordering on ugly, but we need to remember of course that the unit is running a whopping 150W above its rated output in this test. So to complain would be taking the pish just a little bit.
The +12v rail is the one that everybody is critical of, mainly because it's used in some way, shape or form by almost every device in the PC system. But with the MODU87+ I have nothing but praise.
Right the way through the tests it sat at or slightly above its ideal output with only a very gradual downward voltage slope being observed between Test1 and Test4 in the normal load results. Even in the TMax results where it should have been fighting for dear life, it just happily sat at 12.00v grinning at me like a Cheshire cat. Lovely job Enermax.
Of course, the main selling point for the MODU87+ is its gold level efficiency, and based on the normal load results it passes with ease. Only in Test4 when running at just shy of 700w load does it dip to 89.7% which is still plenty of headroom for meeting 80PLUS Gold level certification. The cross-load results are also extremely good with the worst being test TX1 where it dips to 85% when under a 143w load. This may sound low in comparison to the rest of the results, but most other PSU's we've tested recently barely managed to hit 80% efficiency in this test.
OK so no we've covered the basic results, lets turn the page to see the full results set including temperature results, ripple results and stability testing of the +5vSB and -12v rails.