Cooler Master Silent Pro Gold 1000W PSU - Testing the 1000W SPG PSU

Article Index
Cooler Master Silent Pro Gold 1000W PSU
Closer Look, Features and Specs
Cables and More
Inside the SPG 1000W PSU
Testing the 1000W SPG PSU

Testing - 5W, 553W & 1075W: 

We initially plugged the PSU into an EZ PSU Tester 3 in order to power it on for our "idle" measurements.  As noticed below, the voltage rails were fairly stable with no load, but these aren't necessarily indicative of overall load performance.  According to our Kill-a-Watt, the power draw was 5W.  We thought these results would be interesting to include and compare with other power supplies to see how they manage a non-load situation, and how much power the PSU itself will draw.

12v Ripple & Noise
5v Ripple & Noise
3.3v Ripple & Noise
-12v Ripple & Noise


1078W LoadThis is the first Cooler Master PSU that I've looked at and I honestly didn't know what to expect.  This PSU is not very expensive for a "Gold" rated PSU.  As a result, I didn't expect it to be as stable as other PSUs I've looked at recently.  As you can see by clicking the images above, we captured a small 18mV ripple & noise measurement on the 3.3v rail, up to 24mV on the 5v rail and 56mv on the +12v line.  This is nice and clean power as ATX specifications state 50mv is allowable on the 3.3v and 5.0v rails while 120mv is acceptable on the 12v rails.  Even with a really heavy load the Cooler Master SPG 1000W stayed well within specifications on the rails.  The 5v line never strayed above 25mV while the 3.3v line stayed very solid at all loads.  The + 12v lines stayed pretty clean, but the -12v line was the "noisiest" at 82mV noise when under a 1075W load.  That being said, we were really pushing this PSU as we've done a little tweaking to PSU Test Platform and will update that article in the near future.


Instead of taking a ton of pictures of each voltage line under different load, we've graphed the results below.

Ave Voltage


Ave Ripple


The voltage is very solid on the SPG 1000W PSU and while ATX specifications allow an incredible 1.2v fluctuation on the 12v lines - we saw only 0.4v on the -12v line and a mere 0.1v on the +12v line.  The 5v and 3.3v lines were even more solid.  Even though we are allowed a 0.5v variance on the 5v line - we saw a mere 0.02v change.  The 3.3v line is allowed to fluctuate just over 0.3v, but it stayed sock solid with a small 0.03v dip at full load.  This is an excellent showing by Cooler Master.





Cooler Master has been doing the Power Supply thing for a while now and they have several lines of units to choose from.  They have Silent Pro M, GX Series, eXtreme Power Plus, Elite Power and more.  The Silent Power Gold is currently their top of the line series and it seems to perform very well.  We put it to the test and pushed it to its rated limit and slightly beyond and it still survived and did so with dignity.  It continued to deliver high-quality power to our system and we were able to confirm that it can live up to its 1000W claims.  It had no issue powering a Tri-Crossfire system running an overclocked Core i7-920 and a host of other hardware - including an additional 400W 12v load.

It proved to be very solid and stayed within acceptable temperature levels as well.  It wasn't as cool as the Zalman ZM850-HP, but it was still very quiet.  I was very impressed to see Cooler Master include 8 PCIe cables and a hefty enough line to run a quad CrossfireX or a Tri-SLI system.  While the color scheme doesn't get me all excited, the reliable power, clean output and ability of this unit to run at and above its rated load makes it a winner.

There really isn't much of a downside to this PSU.  It is nice and quiet.  This is a very nice PSU that certainly deserves a second look.


  • Low electrical noise
  • Rated at 1200W Max Output and 1000W Output
  • Lots of peripheral and SATA connectors
  • Stable with a VERY heavy load 
  • 13.5cm fan is quiet and unit remains cool when heavily loaded
  • Very affordable 1kW PSU with an 80 PLUS Gold rating


  • "Gold" color on plastic connectors looks cheezy




I'd like to thank Cooler Master  for sending this PSU our way to review.  If you have any questions, comments or general feedback, please feel free to post it in the forum at the "Comments" link below.