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Load Regulation, Hold-Up Time & Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

Cooler Master MasterWatt Maker 1200 MIJ

Cooler Master MasterWatt Maker 1200

FSP Twins 500W

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

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Hold-Up Time

Our hold-up time tests are described in detail here.

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The hold-up time we measured is pretty long, and the power-good signal is accurate.

Inrush Current

For details on our inrush current testing, please click here.

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The inrush current is very low. That large NTC thermistor does an excellent job.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the MasterWatt Maker 1200 MIJ's efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU supports Intel's C6/C7 power states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

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Test #	12V	5V	3.3V	5VSB	DC/AC (Watts)	Efficiency	Fan Speed	Temps (In/Out)	PF/AC Volts
1	8.174A	1.954A	1.972A	0.981A	119.773	91.028%	0 RPM	45.19°C	0.701
12.017V	5.104V	3.343V	5.078V	131.578	41.14°C	115.11V
2	17.383A	2.929A	2.963A	1.180A	239.611	92.922%	0 RPM	46.02°C	0.977
12.011V	5.104V	3.336V	5.076V	257.863	41.85°C	115.09V
3	26.973A	3.427A	3.479A	1.379A	359.871	93.693%	0 RPM	46.52°C	0.980
12.005V	5.103V	3.329V	5.070V	384.095	42.46°C	115.08V
4	36.546A	3.917A	3.971A	1.575A	479.634	93.635%	0 RPM	47.50°C	0.984
11.998V	5.102V	3.322V	5.066V	512.238	43.52°C	115.07V
5	45.794A	4.902A	4.975A	1.776A	599.608	93.142%	640 RPM	42.33°C	0.988
11.991V	5.102V	3.314V	5.065V	643.757	45.13°C	115.06V
6	55.047A	5.879A	5.983A	1.974A	719.505	92.648%	850 RPM	42.79°C	0.991
11.985V	5.101V	3.307V	5.062V	776.603	45.20°C	115.06V
7	64.308A	6.864A	7.001A	2.169A	839.352	92.057%	975 RPM	43.52°C	0.993
11.978V	5.100V	3.298V	5.060V	911.777	45.75°C	115.08V
8	73.579A	7.849A	8.020A	2.370A	959.301	91.243%	1140 RPM	44.38°C	0.994
11.972V	5.100V	3.291V	5.059V	1051.365	46.39°C	115.06V
9	83.296A	8.335A	8.553A	2.369A	1079.306	90.355%	1320 RPM	45.62°C	0.996
11.966V	5.099V	3.285V	5.061V	1194.516	47.60°C	115.06V
10	92.564A	8.826A	9.063A	3.481A	1199.151	89.243%	1500 RPM	46.99°C	0.996
11.959V	5.099V	3.277V	5.020V	1343.695	48.70°C	115.07V
11	102.655A	8.826A	9.078A	3.484A	1319.120	88.076%	1500 RPM	47.32°C	0.997
11.952V	5.099V	3.271V	5.020V	1497.699	49.53°C	115.07V
CL1	0.099A	16.026A	16.006A	0.003A	135.999	83.196%	1015 RPM	45.78°C	0.693
12.021V	5.096V	3.319V	5.200V	163.469	47.80°C	115.13V
CL2	99.928A	1.003A	1.003A	1.002A	1208.249	89.251%	1500 RPM	45.79°C	0.996
11.956V	5.104V	3.295V	5.074V	1353.760	47.75°C	115.07V

Load regulation is quite good at +12V, next to perfect at +5V, and satisfactory at 5VSB. The 3.3V rail performs the worst, although it's still close to 2%. Then again, we aren't talking about your average power supply. This is an incredibly expensive one, so we're not going to be satisfied with anything short of exceptional.

The MasterWatt Maker 1200 MIJ's efficiency is very high; it has no problem delivering full power under high ambient temperatures. Moreover, the fan spins fairly slowly, keeping noise output low as well.

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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

29 Comments Comment from the forums

Dark Lord of Tech

Can you say not worth it ? Not even close.
Reply
SoFlaWill

Quit reading at the price tag. Can I have some of what you're on?
Reply
dstarr3

A THOUSAND DOLLARS?! What on Earth would a desktop PSU have to do to be worth $1,000? Clearly nothing that this PSU in particular is doing.
Reply
dstarr3

Like, seriously, you could build an entire gaming PC with a different 10-year-warranty PSU for the cost of this one PSU. Simply MUST be targeting the more-money-than-sense crowd here.
Reply
jcwbnimble

What was CM thinking with this product? Are there really people out there that would drop $1K on a power supply that was inferior to units that cost half as much? This sounds like a product that CM agreed to just to get Murata in bed with them for future projects.

Murata to CM "Sure we'll start making products for you, just agree to buy our first effort regardless of price point, quality, and technological compromises".

I'm now waiting for the CM case made by Gucci that uses external laptop power supplies, has room for only one 7mm SSD, and can't even accommodate a 7" GPU. I'd pay $1k for it as long as everyone knows it's made by Gucci.
Reply
jcwbnimble

Oh, and I forgot to mention that it comes with ribbon cables. How did CM "spare no expense" when it includes basic black ribbon cables? Come on guys, you should have blasted this PSU the second you opened the box and saw ribbon cables on a $1000 power supply.

AND this thing is huge. Seriously CM?!!! The PSU on my original IBM PC/AT wasn't this large, and that had capacitors the size of D batteries in it.

Total fail by Murata and even bigger fail by CM for putting their name on it.
Reply
dstarr3

lol Someone in the comments is actually trying to defend this product with downvotes. I'm sorry, but at this pricepoint, this product is indefensible.
Reply
drwho1

Like everyone is saying, NO Thank You, anyone can build an entire system for $1000 or less WITH a powerful/trusted PSU included.
Reply
InvalidError

19609320 said:
Oh, and I forgot to mention that it comes with ribbon cables. How did CM "spare no expense" when it includes basic black ribbon cables?
What is the problem with "basic black ribbon cables"? Personally, those are my favorite. I much prefer that over individual loose wires and braiding that snags on every somewhat sharp corner, screw and anything else that might stick out a bit.

@Arris: the "some other way" to rectify AC without a bridge is bridge-less APFC where the boost diodes and the APFC FETs effectively replace the input bridge.
Reply
TheFuzzz

the box and packaging are nice. $1,000.... It should have a lifetime warranty
Reply

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