Today's power supply is from the very well established case manufacturer,
In Win. The 1200W we have here is the flagship of their new Commander
II series of power supplies.
In Win is not new to power supplies. In fact, they have several series. The
Commander II series seems to be the replacement for the Commander series from
a few years ago. A lot has changed since that series, most alarming of which
The Commander was built by Channel Well, but this new Commander II series is
built by Andyson.
From the front of the box, we see that this unit is modular (in text only,
as the picture of the unit shows only the exhaust end of the power supply),
has Japanese capacitors and "strict voltage regulation" (+/- 5% is
not considered "strict" by jonnyGURU.com standards. I hope it's better
than that.). The unit is also supposed to be 80 Plus Bronze efficiency, meaning
PSU is 82%, 85% and 82% efficient at 20%, 50% and 100% loads respectively,
is Nvidia SLI ready and has a 5 year warranty.
The side panel tells us a little more. Of course the unit features 6+2 pin
PCIe power connectors (that means that the PCIe power connectors for the graphics
card can be either 6-pin or 8-pin), has active power factor correction, is
compliant with ATX12V 2.3 and EPS12V 2.91, has a 135mm dual ball bearing intake
fan, has "industrial grade protections" and uses DC to DC for the non-primary
When a power supply uses DC to DC, that means that the power supply is essentially
a big +12V AC to DC switchmode power supply. DC to DC voltage regulator modules
(or "VRM's") are used to bring that +12V down to +3.3V and +5V.
Also on this side of the box is a table that illustrates what the efficiency
of this unit should be. According to this table, the efficiency of this unit
is actually BETTER than 80 Plus Bronze at 20% and 50% loads. We'll see about
We also see a chart here that illustrates how the fan's speed is increased
as load and temperature increases.
Along the bottom, In Win has put little icons to represent the 135mm ball
bearing fan, the modularity, high efficiency, the SLI support, PCIe 2.0 connectors,
RoHS compliance, ErP LOT 6 compliance and low noise.
The back of the box has a lot more information on it. Some of the information
is redundant. Let's zoom in and see what's being said here...
Like I said, a lot of this information is redundant. There are a few new bullet
points here. Like "four independent +12V outputs". Really, the outputs aren't
independent. You have one +12V output and this is split into four circuits,
each with a limiter on it that will shut off the power supply if the current
is exceeded. We'll test to see if this functions as advertised.
The 4-pin Molex
connectors are apparently patented as they are "Easy-Swap". I believe "Easy-Swap" is the trade name given to the Molex-type connectors with the "squeeze release" on them.
Right here we're told that the unit uses a double forward topology. The terminals
are also supposedly gold plated.
There's some more bullet points reiterated on this part of the back of the
box as well. In addition to what we already know about this unit, it is here
they list an MTBF of 120,000 hours, which is a bit more than average and the
protections" are listed out as OVP (PSU shuts off if voltages exceed spec),
OCP (PSU shuts down if a certain current is exceeded), OPP (the PSU shuts off
if it's asked to put out too much power), UVP (PSU shuts off if voltages drop
below spec) and SCP (protection that shuts the unit off if a short is sensed).
We are also provided a DC output table. I've recreated the table below:
Commander II 1200W
The interesting thing about the above table is that they specify a +3.3V,
+5V and +12V combined wattage that's greater than the +12V capability. Typically,
when you have a power supply that uses DC to DC VRM's for the non-primary rails,
your +3.3V, +5V and +12V combined wattage is the same as the +12V capability
since the +12V is what provides the power that's to be converted to lower voltages
by the DC to DC VRM.
Another thing that's interesting here is that our power supply looks more
like an 1100W power supply, as opposed to a 1200W power supply. If our +3.3V,
+5V and +12V combined output capability is 1079W and our -12V and +5VSB combined
is 21W, that's a total of 1100W. Not 1200W. Where did the other 100W come from?
There is also a cable count on the back of the box, although it does not say
which of these cables are fixed and which ones are modular, so we'll have to
open up the box and see what's what before we can report on that.
Apparently there is a user manual inside. Maybe it can tell us what cables
are fixed and what are modular... and since this unit has four +12V rails,
maybe it will tell us what rails power what cables. This part of the box also
tells us that the unit also has a number of regulatory certifications as well
as a reminder not to
As we open the box, we see the user manual we were told to expect, a power
cord and a nylon bag to store unused modular cables in.
And here inside the box is another smaller box that has all of our modular
cables, a few Velcro straps and four mounting screws. Let's have a look inside
So our manual is really a large fold out and it's really only
one and a half pages translated in eight different languages. The full page
has the package contents, the specifications for the Commander II 750W, 850W
and 1200W, a warranty statement, a list of connectors and some installation
and safety notices.
There is also a pretty big typo on this page. Under the specifications, the voltages
for the over voltage protection and under voltage protection are listed as
the exact same voltage. Oops! Under voltage protection should be LOWER, not
Click to enlarge
On the half page, we have a diagram showing the cables coming
out of the power supply and the modular interface. We're shown that the modular
connectors for the Molex, floppy and SATA connectors are on +12V1 and that
one modular PCIe connector is on +12V3 while the other is on +12V4, but what
+12V rail do the fixed cables use? With a good deal of help, I finally got
it figured out:
The rail distribution is a little wacky, but since there the OCP is set to
40A on each +12V rail, there shouldn't be any problem with tripping the power
supply off under heavy loads. That is; unless you are using a load tester.
Now let's take a look at the power supply...
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