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!

MasterWatt Lite 600W – Overshoot Transient Tests
VSB On VSB to Full, 12V Off to Full, 12V

I can, however, let these 12V results pass, because they look as smooth and continuous to me as I could ask for. That said, the standby rail does have a little bit of a spike going on, so it’ll lose half of the S&C point later. Like that’s this unit’s biggest problem at this point.

Let’s run the hot tests. This guy is a bit small, so forty degrees might be pushing it, but we should get close.

MasterWatt Lite 600W – Hot 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/
236.4V 82.3% 0.836 26°C/
3.374V 5.07V 11.78V
2 1.5A 1.5A 9A 121.0W/
233.6V 86.5% 0.932 28°C/
3.361V 5.08V 11.76V
3 4A 4A 22A 298.3W/
230.6V 86.7% 0.982 32°C/
3.319V 5.06V 11.76V
4 6A 6A 33A 447.6W/
229.8V 85.5% 0.989 36°C/
3.282V 5.06V 11.75V
5 8A 8A 44.5A 598.7W/
227.9V 83.1% 0.992 38°C/
51 °C
3.246V 5.06V 11.69V
Crossload Tests
CL1 14A 14A 0A 112.1W/
235.7V 74.9% 0.937 29°C/
3.306V 4.61V 12.71V
CL2 0A 0A 46A 490.2W/
231.6V 83.7% 0.990 36°C/
3.296V 5.58V 10.63V

Huh. It did thirty-eight degrees with no problem. No shutdowns, power draw wasn’t running amok, it just did the thing until I asked it not to do the thing. And it still ticked all the 80 Plus boxes, too.

Unfortunately, it still hit all the same “tick me off” boxes it did cold. Both crossload tests are still way out of spec with no attempts to shut down. Two of the three rails regulated worse in the progressive tests… the 3.3V is now at a below average 3.88%, the 5V rail is the same at 0.40%, and the 12V is now at 0.75%. That’s an average of… wait. You know what? No more going easy on group designs. This is current year. Even DC to DC designs can be done cheaply now. Let’s average the crossloads into the voltage regulation scores.

That means the 3.3V rail stays at its 3.88% while the other two descend past mediocrity into truly terrible 19.40% and 17.33% numbers. Averaged, we’re now looking at 13.54%, which is absolutely terrible. It’s just outside the ATX spec for the negative 12V rail, which in itself sounds awful. Granted, we need to refine this a bit yet. Having a zero load condition on any one rail like this isn’t fair to a group design, because they cannot cope with that. Like, say, requiring the minimum loads Intel sets out for Haswell, perhaps. And yet, having these zero loads on this unit has absolutely uncovered an issue with the protection circuitry.

So, y’all can comment in the forum thread later and tell me what you think. Right now, I’m moving down to the scope shots.

MasterWatt Lite 600W – Oscilloscope
Test # +3.3V +5V +12V

Could be worse. Could also be better. The 12V rail is at 40mV, which is outside excellence and into very good territory. The 5V rail is at 55mV at worst, which is just out of spec. And the 3.3V rail is at 16mV, the only rail to show the excellent numbers.

Ugh. Now I need to remember how I scored the last unit that went out of spec on these shots. Even so, it’s not that far out. But will I let it slide? Nope. I won’t.

Let’s take this thing apart.