In Win Commander 1200w

Overall Score

As always, testing is performed with XCPU’s SunMoon SM-5500ATE PC test load. This complex and rather expensive piece of equipment is designed and built to stress and test computer power supplies. As such, it is the ideal tool for doing load testing. Coupled with a low-bandwidth PC based oscilloscope, the setup makes for very easy and accurate power supply testing.

Testing consists of four main tests, and two crossload tests. The four main tests are meant to simulate a normal computing environment, where each test is an increment of 25% of the power supplies’ rated capacity. (25%, 50%, 75%, 100%) The two crossload tests are meant to test the ability of the power supply to operate in uncommon situations. The first test draws a lot from the 3.3v and 5v rails, while pulling a miniscule 1A from the 12v rail. The other crossload test is a large load on the 12v rail, and only 1A on both 3.3v and 5v rails. Older systems (Pentium II/III) use a lot of 3.3v and 5v power, and modern systems use a lot of 12v power, so these crossload tests help to demonstrate that the PSU can handle anything thrown at it.

Unfortunately, temperature testing did not make it into this review, so hot-box testing will be noticeably absent from this review. Hot-box tests will be included in reviews when the proper equipment arrives. All tests below can be considered “cold” tests. The temperature in the room was kept at a constant 68F (20C) during the tests.

First, let’s take a look at the specifications for the PSU as shown by InWin:

An interesting power output setup due to the nature of this design. Because this power supply consists of two ‘twin’ power supplies, the total amperage is divided between the two ‘sides’ of the power supply. Each ‘side’ has two 12v rails attached; one at 20A and one at 36A. In addition, each side carries the load of one of the other rails- one carries a 30A 3.3v rail, and the other has a 30A 5v rail. Although the four 12v rails total 112A, written on the label is a warning that you should not exceed a total 99A on the 12v rails. Put all the rails together, and the PSU is rated at 1200w. You may also see that the label says not to remove the cover…oops.

Let’s test the validity of that label with the Sunmoon:

Nothing we haven’t seen before. Tests 1-4 completed sucessfully, and well within parameters. Test CL1 did not go as well as it could have though. The power supply would only start for a fraction of a second, then shut off. We found that if we increased the 3.3v and 5v load, or reduced the 12v load, the PSU would start and run as normal. As all computers use at least some 3.3v and 5v power, this problem seems to be a non-issue. Worth noting, nonetheless. Other than that, very good.

Let’s move on to the ripple testing:

Test 1- 3.3v 5v 12v


Test 2- 3.3v 5v 12v


Test 3- 3.3v 5v 12v


Test 4- 3.3v 5v 12v


Test CL1- FAIL!


Test CL2- 3.3v 5v 12v

A passable result, minus the CL1 test. The first tests have a fairly low level of ripple, but by the end of test 4, the 12v rail rose to a much higher level of ripple. At about 100mV, it is still within the 120mV specification, but it is desirable for it to run at a lower level of ripple. It also deals with the CL2 test well enough. Overall, it passes, but not with the highest marks.


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