be quiet! Dark Power Pro 11 1200W Power Supply

REVIEW INFORMATION
SUPPLIED BY: be quiet!
MANUFACTURER: be quiet!
PRODUCT: Dark Power Pro 11 1200W
PROD LINK: Dark Power Pro 11 Product Page
PRICE: $249.00 @ NewEgg
Price is at the time of testing!


Dark Power Pro 11 1200W – Overshoot Transient Tests
VSB On VSB to 100%, 12V Off to 100%, 12V
O-Scope Shot O-Scope Shot O-Scope Shot

We’re getting close to running the hot tests. But first, let’s look at the power up spike tests. What do you think about these? I’ll tell you what I think. I’ve seen better results than these. There’s a tiny spike on all three of the above scope shots. But, I’ve also seen much worse. These spikes are very well controlled, and well inside the ATX spec. I don’t plan to complain about these results, at any rate.

Now… this unit is huge, and only rated for full blast at forty degrees. I will try to stay below that number, but even with all the hot box fans, I don’t know if it will happen. Let’s find out.

Dark Power Pro 11 1200W – Hot Load Tests
Test # +3.3V +5V +12V1 +12V2 +12V3 +12V4 DC W/
AC W
Eff. AC
Input
P.F. In./
Ex.
Progressive Load Tests
1 1.0A 1.0A 8.9A 0.0A 0.0A 0.0A 119.7W/
139.0W
119.1V 86.1% 0.982 27°C/
29°C
3.38V 5.07V 11.94V 12.00V 11.99V 11.99V
2 2.0A 2.0A 4.5A 4.5A 4.5A 4.5A 239.6W/
266.2W
119.7V 90.0% 0.997 29°C/
32°C
3.37V 5.06V 11.94V 11.97V 11.96V 11.96V
3 4.5A 4.5A 11.5A 11.5A 11.5A 11.5A 596.3W/
653.5W
117.0V 91.2% 0.998 34°C/
39°C
3.34V 5.03V 11.89V 11.94V 11.94V 11.94V
4 7.0A 7.0A 17.0A 17.0A 17.0A 17.0A 879.8W/
976.2W
116.6V 90.1% 0.999 36°C/
46°C
3.32V 5.02V 11.84V 11.92V 11.91V 11.92V
5 9.0A 9.0A 23.0A 23.0A 23.0A 23.0A 1185W/
1340W
115.2V 88.4% 0.999 39°C/
53°C
3.29V 4.99V 11.82V 11.91V 11.90V 11.91V
Crossload Tests
CL1 18.0A 18.0A 0.0A 0.0A 0.0A 0.0A 155.4W/
185.9W
119.0V 83.6% 0.989 34°C/
38°C
3.33V 5.03V 11.97V 11.97V 11.97V 11.97V
CL2 0.0A 0.0A 24.75A 24.75A 24.75A 24.75A 1181W/
1329W
116.5V 88.9% 0.999 38°C/
51°C
3.33V 5.03V 11.81V 11.91V 11.90V 11.91V

Well, there you go. We did actually stay under forty, by exactly one degree, and the unit handled that just fine. No, I still couldn’t hear it.

Efficiency was up in test one but down on the remainder of the progressive tests. That’s not unusual when the heating starts. Even so, the unit still just barely clears Platinum in much the same way it did cold. It’s just a little closer to the line, is all.

Let’s run those stability numbers again. I see 2.7%, 1.6%, 1.0%, 0.7%, 0.7%, and 0.7% this time out. That gives us an average of 1.23%, which is an improvement on the cold tests and just a little more excellent. Nice… we’ll take that!

Dark Power Pro 11 1200W – Oscilloscope Tests
Test # +3.3V +5V +12V1
1 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
2 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
3 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
4 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
5 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
CL1 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot
Test # +3.3V +5V +12V1
CL2 O-Scope Shot O-Scope Shot O-Scope Shot
+12V2 +12V3 +12V4
O-Scope Shot O-Scope Shot O-Scope Shot

Alas, the excellence doesn’t quite extend to the scope shots. Not, mind you, for the performance of the minor rails. No, those are under 15mV at all times.

It’s the combined results of the 12V side of things that comes up as a slight disappointment for yours truly. The high-frequency component is fine… if we judged the unit on that alone, we’d be scoring on a 10mV number. But it’s not that simple – some low-frequency ripple is making it into the 12V output on this unit, raising the number to just about 50mV on the nose. That’s into “very good” territory.

This, folks, is why we monitor ripple with the settings we do. If we looked at the high-frequency aspect alone, as more than one engineer has complained to me about, we’d miss that low-frequency stuff and a lot of units would score better than they do.

But enough about that. Time to take this thing apart.