But first, a look at the power on spikes present on the 5VSB and 12V rails. That is... what we can see of them. The 5VSB rail is the only one that produced any notable spiking action. It briefly blipped over the 5V mark and then dropped down right away to final operating voltage. Considering that the scope shot was taken with the 5VSB loaded all the way down, we can be very pleased indeed with these results. ATX spec allows for the spike to hit 5.5 volts, and this unit didn't even get near that.
The 12V rail was even more impressive. There is a spike - it shows up as a little hitch in the waveform just over the 5V mark - but it's so tiny it might as well not be there at all. I'm very happy with this unit so far.
But let's cook it alive anyway and see if it dies. It's supposed to hit full power at 50 degrees, so I'll disable both the intake and exhaust fans in the hot box. And, for good measure, I'll turn off the SunMoon's auxiliary exhaust fan too. That'll heat things up. I'll leave the helper fan in the heat duct to the hot box enabled, however - we want the SunMoon staying relatively cool.
Results from Kingwin LZP-550 HOT load tests
Test #
+3.3V
+5V
+12V
DC Watts/ AC Watts
Eff.
P.F.
Intake/ Exhaust
Progressive load tests
1
1A
1A
8A
111.4W/ 123.1W
90.5%
0.987
27°C/ 28°C
3.35V
5.15V
12.24V
2
2A
2A
16A
220.0W/ 239.9W
91.7%
0.983
31°C/ 32°C
3.34V
5.13V
12.22V
3
3A
3A
25A
340.6W/ 370.0W
92.1%
0.987
36°C/ 39°C
3.33V
5.12V
12.21V
4
4A
4A
33A
448.5W/ 491.7W
91.2%
0.990
42°C/ 46°C
3.33V
5.11V
12.19V
5
5A
5A
41A
556.4W/ 614.9W
90.5%
0.992
48°C/ 52°C
3.32V
5.10V
12.18V
Crossload tests
CL1
12A
12A
1A
118.3W/ 135.0W
87.6%
0.991
39°C/ 42°C
3.33V
5.09V
12.24V
CL2
1A
1A
45.5A
567.2W/ 626.2W
90.6%
0.992
46°C/ 51°C
3.33V
5.12V
12.17V
Folks, if I was happy before I'm ecstatic now. Not only did this unit pass Platinum again, it laughed at it. This is quite possibly due to the airflow in the hot box from the helper fan. The unit's own fan stayed off again until test four, when it kicked in at four minutes and fifty seconds. That's pretty impressive when you think about it. Test three was fanless, and yet the unit managed to significantly better its cold test efficiency. I'd say Kingwin has good reason to be proud of this unit.
Did I mention the fan shut down again in test CL1? Well... it did. It came back on about two minutes into test CL2. This thing keeps its cool better than a popsicle in space.
And the voltage readings... would you look at that. The 3.3V and 12V rails' regulation numbers have not moved off the cold test results. At all. Heck, the 5V rail even did better. This is unreal, people. Heating up these things is supposed to make them beg for mercy - this thing keeps yawning at me.
Let's look at the scope shots. This bad boy can't possibly get any better than what we've seen so far.
Oscilloscope Measurements - Kingwin LZP-550
Test #
+3.3V
+5V
+12V
Test 1
Test 2
Test 3
Test 4
Test 5
Test CL1
Test CL2
How do I like my crow? Ketchup. Lots and lots of ketchup. This puppy wasn't done impressing me, it seems. Under 30mV for the 12V rail, under 10mV for the two minor rails. Just try and tell me that isn't impressive. This may be the best performing unit in this size I've ever seen.
Naturally, there's only one thing to do - take it apart.
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