Cooler Master Silent Pro Gold 1200w

9 Overall Score

5 Year Warranty, Modular Cabling, 80 PLUS Gold Efficiency Rating, All 105C Rated Japanese Capacitors, Excellent 3.3v and 5v Regulation

Fixed and Modular Cables Do Not Match, Fan Is Not 'Silent' Under High Load, Some Teapo Brand Taiwanese Capacitors, Some Units May Not Reach 80 PLUS Gold Standards

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.
As a supplement to our normal tests, we have also added a Torture Test. This test consists of an hour long test at 110% of the unit’s rated output. Also, this is done in a very warm environment.

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

98A on the 12v rail- that should be enough for just about anything. Also, notice that “As sealed stick was removed, lost or damaged, it shall be out of warranty validity!” It’s good that they’re warning us that if you open the unit, the warranty will be void; however, this kind of, for lack of a better word, ‘engrish’ should not be making it onto the retail product of a company as large as Cooler Master. This is actually the second time that we’ve seen this exact warning on a Cooler Master PSU- a word to the manufacturer: FIX IT!

Running our standard battery of tests, we found:

From these tests, we can see a lot of good things. First, the voltage regulation is quite good. The small voltage droop from 25% load to full load is more than acceptable. To nitpick a bit, the 12v rail’s voltage is a tiny bit higher than we would prefer. Second, we can see that the unit’s efficiency is extremely high. However, according to our results, this unit does not quite meet the requirements of the 80 PLUS Gold certification: the standard states that the unit should be at or above 90% efficiency at 50% load. In our testing, this corresponds to Test 2, and our unit ‘only’ mustered 89.2%. Also to meet the certification for Gold, the unit must meet 87% efficiency at 100% load. Again, our unit came up short at 85%. Assuming our test unit is typical of the Silent Pro Gold 1200w, this model really should be rated as an 80 PLUS Silver PSU.

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- 3.3v 5v 12v


Test CL2- 3.3v 5v 12v

These results are fairly middle of the road. The ripple on the 12v rail increases to about 60mV by Test 4, which is about 1/2 of the tolerance permitted. The 3.3v and 5v rail regulation is rock solid.


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