Cooler Master MasterWatt Lite 600W (230V) Power Supply

PRODUCT: Cooler Master MasterWatt Lite 600W 230V
PROD LINK: MasterWatt Lite 600 Product Page
PRICE: 4,000 Rupees @ MD Computers
Price is at time of testing!

Okay. Kong is here, the Rek power meter is once again wired for 230V (it can take up to 600V), and we are ready to get some science done. As always, the FastAuto ATE will be doing the loading, with all the usual test gear helping out.

I will also say a short prayer that this unit doesn’t burn itself up and Kong along with it. Kong is good for a kilowatt, but I like to stay well under that number.

MasterWatt Lite 600W – STANDBY Load Tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5 2.52W/
0.131 79.8%
2 1.25 6.26W/
0.273 78.0%
3 2.5 12.45W/
0.399 76.4%

First up, the standby tests. Nothing very exciting here, I have to say, at least when it comes to the efficiency. It’s above average, but barely so. Nothing goes higher than 80%.

Voltage regulation, on the other hand, is an excellent 1.00%. I hope this trend continues. Let’s run the main tests.

MasterWatt Lite 600W – Cold Load Tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive Load Tests
1 1A 1A 4.2A 59.2W/
236.7V 82.1% 0.831 25°C/
3.372V 5.08V 11.78V
2 1.5A 1.5A 9A 121.1W/
236.2V 86.7% 0.931 25°C/
3.359V 5.08V 11.77V
3 4A 4A 22A 298.4W/
233.8V 87.1% 0.980 26°C/
3.314V 5.06V 11.76V
4 6A 6A 33A 447.3W/
231.9V 85.7% 0.988 27°C/
3.275V 5.06V 11.74V
5 8A 8A 44.5A 599.8W/
230.9V 83.6% 0.991 27°C/
3.257V 5.06V 11.71V
Crossload Tests
CL1 14A 14A 0A 112.0W/
237.3V 75.2% 0.935 27°C/
3.314V 4.60V 12.75V
CL2 0A 0A 46A 490.7W/
231.3V 84.0% 0.989 27°C/
3.301V 5.59V 10.64V

Looks like we have a few things to flap our gums and wag our jaws about here. I’ll start with the easy stuff… efficiency. There, we have a clean pass for 80 Plus white Europe. Actually, it’s not too far off Bronze numbers, but just far enough to keep me from calling it that.

But the good news ends right there. I take no issue with the voltage regulation numbers from tests one to five. Not that these numbers are perfect, mind you. The 3.3V rail is on the low side of average at 3.48%, the 5V rail is at a mythic 0.40%, and the 12V rail is an excellent 0.58%.

No, where I have to come down on this unit is in the crossload tests. This unit does nothing well, there. We have numerous out of spec readings on both the 12V heavy and minor rail heavy tests, meaning this is an old design indeed on the secondary. In fact, the 12V rail is so damn low in test CL2, I’m thinking if this unit does have undervolt protection, it’s not working right. It’s below ATX spec on that test, that rail, by over 10%! The 5V rail is equally out of spec! It’s absurd… these numbers should be shutting the unit down!

Folks, the crossload tests are so bloody far out of spec on the 5V and 12V side of things I’m already going to tell you to buy something else. Seriously, in test CL2 I actually went looking for the point at which the 12V rail finally came back into spec by increasing the 5V load. That point was at two bloody amperes, and even then it was only just hitting the 11.4V low end of the spec. You do NOT want this thing running anything newer than Haswell unless you disable the advanced sleep states. Failure to do so may kill your hardware.

Suffice it to say that this thing is definitely group regulated. No indy design has ever given me results this terrible. And yet, with an average of 1.49%, you’d actually think it was an excellent performing unit. Do NOT be fooled. In fact, I’m not sure my performance scoring methodology even cuts the mustard on a unit like this. I usually give group designs a pass because by nature they never do crossloads well. Yet this thing is so bad at it, it transcends the limits of acceptability. I need to figure out a way to score on this by page six, because I cannot let this pass.