Reviews - Allied AL-D500EXP 500W power supply review
  (By Oklahoma Wolf on Sat, Aug-18-2007)

Page 2 -

     For those not familiar with the way we test our watt boxes here at jonnyGURU.com, here's a quick refresher. Each power supply is connected to a SunMoon SM8800 ATE, which is a fancy electronic load designed for specifically testing computer power supplies. It features a number of Molex connectors in front from a standard 24 pin ATX connector to several hard drive connectors to six pin PCI-E connectors designed to load down each rail of the power supply and obtain an accurate idea on just how well the power supply is working.

     The SunMoon can give us up to ten preset loads, but we're only going to use five of them on our dear Deer. These tests will present a balanced but increasing load until we (hopefully) arrive at full blast. Then, we're going to have us some venison after we roast yonder Allied in a borrowed incubator and see how it does. What happened to testing for crossloading you ask? Funny you should ask, and I promise there's a good reason. But let's get the five main tests done first, and then I'll let you in on the big secret.

Results from Allied AL-D500EXP COLD load tests
Test # +3.3V +5V +12V1 +12V2 DC W/
AC W
Eff. P.F. Intake/
Exhaust
Simulated system load tests
Test
1
1A 1A 3A 2A 84W/
115W
73% .57 26°C/
30°C
3.31V 5.1V 11.93V 11.97V
Test
2
2A 3A 5A 6A 168W/
218W
77% .61 27°C/
34°C
3.29V 5.1V 11.85V 11.89V
Test
3
3A 5A 8A 9A 251W/
330W
76% .64 27°C/
35°C
3.27V 5.1V 11.72V 11.78V
Test
4
5A 8A 12A 11A 342W/
467W
73% .68 27°C/
37°C
3.25V 5.06V 11.66V 11.77V
Test
5
N/A N/A N/A N/A FAIL FAIL FAIL FAIL
FAIL FAIL FAIL FAIL

     The test five results should give you a pretty good idea why the crossloading tests weren't done. Quite simply, right after test four was begun, after recording the data and scope readings, the Allied exploded. And I'm not talking about the quiet pop of a blown fuse either, this was something to make one holler things like, "Incoming!" "Honey, I'm so scared, what's happening?" and, "You'll never take me alive, coppers!" This was accompanied by a light show to rival the best Hollywood pyrotechnics displays. I distinctly heard Mother Nature yell out, "Now that's not fair, I can do lightning WAY better than that!"

     The results of the testing do point to a few interesting things with this unit. First, take a look at the 5V readings. They just don't budge until test four, when the PSU was getting ready to hose itself. Similarly, the 3.3V rail didn't fluctuate too much either. All the action is over on the two 12V rails, where by test three they were already heading for disaster. Efficiency never got to 80%, and while high efficiency is typically not a hallmark of a cheaper power supply, this isn't supposed to be one of Deer's cheaper units. While I can excuse 77% and 76%, the 73% we got on the other two tests is not a pretty number. However, the declining efficiency in test four is quite possibly a harbinger of certain doom instead of normal operations for this unit. So, we'll let efficiency in test four slide... for now. PFC is mediocre, as this unit lacks correction of any type.

     So, now we have a dead Allied that hasn't even made it to the hot box. What shall we do with it? Well, just to rub it in a little, I'll put up the hot box table anyway.

Results from Allied AL-D500EXP HOT load tests
Test # +3.3V +5V +12V1 +12V2 DC W/
AC W
Eff. P.F. Intake/
Exhaust
Simulated system load tests
Test
1
1A 1A 3A 2A FAIL FAIL FAIL FAIL
FAIL FAIL FAIL FAIL
Test
2
2A 3A 5A 6A FAIL FAIL FAIL FAIL
FAIL FAIL FAIL FAIL
Test
3
3A 5A 8A 9A FAIL FAIL FAIL FAIL
FAIL FAIL FAIL FAIL
Test
4
5A 8A 12A 11A FAIL FAIL FAIL N/A
FAIL FAIL FAIL FAIL
Test
5
N/A N/A N/A N/A I said it's DEAD
IT'S DEAD JIM! !!!!

     On to the few ripple tests we were able to do before the sky fell. We used a USB Instruments Stingray DS1M12 right at the load to see what was what. That reminds me, when I was a kid I actually wrote a song called "What is What," in which I repeated the title words over and over accompanied by air guitar. No wonder my parents' hair went gray early. Back on topic, our voltage scale will be .05V or 50mV.

Allied AL-D500EXP

+3.3v

+5v

+12v1

+12v2

test 1

test 2

test 3

test 4

     Now we get some real interesting results. At its worst, ripple barely hits 35mV, and that's including that there funky waving the 12V rails were doing. Whatever went on in there to make it give us a light show, these ripple results make me inclined to think it had nothing to do with the secondary side of the unit.

     Curiosity now fully aroused, I just had to do a full autopsy. Next page, if you will.



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