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Enermax Galaxy EVO 1250W

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Posted November 4, 2009 by Jake in Cases & PSU

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by Jake
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Setup & Results

To test power supplies, we believe that creating real-world circumstances and conditions are important to consumers who need to relate to what they would use and experience in a computer system setup. Consequently, our methodology is fairly straightforward: we assemble the most power-hungry components we can muster, hook up the power supply, and take measurements at idle and load using a Kill-A-Watt meter for wattage, and a digital multimeter for voltage output and fluctuations. Unfortunately our new oscilloscope has not yet arrived, so we apologize we’re not able to test DC output quality on the unit today.

To break this down a bit further, we conduct primarily 4 tests:

  • Idle: The system sits at idle in Windows
  • CPU Load: In this test we run concurrent instances of Prime95 on all CPU cores
  • GPU Load: In this test we run FurMark, as it recognizes SLI and CrossFire setups and loads the GPUs very heavily with maximum settings
  • System Load: In this test we run concurrent instances of Prime95 and FurMark to draw the maximum amount of wattage possible

As we’ve already mentioned, the Enermax Galaxy EVO 1250W is an absolute monster and with that much available power it is difficult to muster something that can push it that hard. However, we’re pulling out all the stops today, as we’ll start with an Intel Core i7 quad core processor that is highly overclocked.  It is cooled with a exceedingly large thermoelectric (TEC/Peltier) watercooling setup that also draws a massive amount of power on the system, far more than any traditional cooling method.  We then connect three graphics cards in Crossfire/SLI to tax the power supply even further.  This setup can easily pull down some extremely high wattage, pushing the Galaxy EVO 1250W far more than even the most hardcore systems that users would have at the best of times in a real-world setup.

When examining the results we are looking for the voltage output and any fluctuations that might occur.  The current ATX specifications allow for the following fluctuations in voltage outputs, and these represent a 3% variance:

  • 3.3V Rail:   3.135V – 3.465V allowable
  • 5V Rail:      4.75V – 5.25V allowable
  • 12V Rail:   11.4V – 12.6V allowable

Test Setup

Below are the results:

+3.3V

+5V

+12V

When we look at the voltage regulation results above, this is where the Galaxy EVO 1250W really stands out; it posts excellent results across the testing spectrum, even on the full system test.  The +5V moved slightly more than we expected but nothing whatsoever to be concerned about. The +12V rails held rock solid, barely nudging when heavily loaded, and loading up a system like this is no easy task to begin with. While the EVO isn’t quite as efficient as its brother the Revolution, it still posts very impressive results.

One last note here relates to the noise produced by the unit.  As we know, the higher RPMs a fan speeds, the louder the noise, but then also the cooler the temperatures. It is an ongoing balancing act between noise and cooling for just about any mechanical component in a system.  To that end, it seems that the Galaxy EVO 1250W is able to maintain low sound levels even though the fan spins at higher RPMs when under heavy load. Frankly, it is very quiet. This is particularly impressive, as we’ve seen that some kilowatt+ unit fans are not quiet when working at higher loads and resulting RPMs. Enermax has done an excellent job here keeping the Galaxy EVO 1250W very quiet across the load spectrum. Comparing it to a few other units we’ve tested, it is very quiet and will be inaudible inside a case.

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