Reviews - In Win Commander II 1200W
Sample Provided by: Inwin Development (By jonny on Mon, Jul-11-2011)

Page 1 - Unit overview

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 is the OEM. 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 standards. I hope it's better than that.). The unit is also supposed to be 80 Plus Bronze efficiency, meaning that the 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 rails.

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 that.

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 "industrial grade 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













Max Power








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 chuck the unit in the trash when it dies.

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 that manual...

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 higher.

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:

In Win Commander II 1200W

Type of connector:


+12V Rail:
Fixed Cables

20+4-pin ATX connector (550mm)



4+4-pin ATX12V/EPS12V (600mm)



8-pin EPS12V (600mm)



PCIe (2 cables w/ 2 connectors each) (500mm+150mm)


& 2
Modular Cables
PCIe (2 cables w/ 2 connectors each) (500mm+150mm)
& 4

SATA (2 cables w/ 4 connectors each) (550mm+150mm+150mm)



5.25" Peripheral Power Connector (2 cables w/ 4 connectors each) (550mm+150mm+150mm)



3.5" Drive power adapter (+150mm)



Unit Dimensions(L x W x H)

165mm x 86mm x 150mm

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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