Reviews - Seasonic Platinum 660XP 660W
Sample Provided by: (By OklahomaWolf on Mon, Dec-17-2012)

Page 3 - Cold Testing

Ok, here we are again. Load testing. As usual, I'll be using one of the two SM-268 load testers to do my loading. Helping out will be the same stuff I always use these days: Tektronix TDS-2012B scope, Extech DMM, dual probe thermometer, and Rek RF-9901 power meter.

Results from Seasonic SS-660XP
STANDBY load tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5A 2.56W/
0.349 82.8%
2 1.5A 7.62W/
0.506 79.0%
3 3.0A 15.1W/
0.573 76.3%

Starting things off, the standby efficiency tests. Here we are already seeing Seasonic's commitment to high efficiency, for this unit is more efficient than the usual 75% or so I see from most units. Gooooood.

In fact, test one is way above 80%, which is a real nice change from the last two units I reviewed, Hercules and Zeus.

Results from Seasonic SS-660XP low load test
+3.3V +5V +12V -12V 5VSB DC Watts/
AC Watts
P.F. Eff.
10.2% 1A 1A 4.5A 0.2A 0.5A 67.5W/
0.953 86.1%
3.34V 5.03V 12.07V -11.45V 5.10V

You know what else is way above the usual? Efficiency in this test right here. Even other Gold and Platinum units have trouble coming up with a number this high in the 10% load test.

In fact, given my 1% margin of error I allow to make up for equipment inaccuracies, this thing is already passing the entry point for Gold in this here test. Things are already looking very good indeed for Seasonic, and we haven't started the main series of tests yet!

Results from Seasonic SS-660XP COLD load tests
Test #
+3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1A 1A 10A 133.8W/
120.4V 91.0% 0.979 25°C/
3.34V 5.03V 12.06V
2 2.5A 2.5A 20A 269.1W/
120.0V 92.1% 0.994 27°C/
3.34V 5.03V 12.04V
3 3A 3A 24.5A 329.5W/
119.8V 92.0% 0.995 29°C/
3.34V 5.03V 12.02V
4 5A 5A 39A 521.9W/
119.7V 91.1% 0.992 31°C/
3.34V 5.03V 11.99V
5 6A 6A 49A 653.6W/
117.7V 90.0% 0.992 27°C/
3.34V 5.03V 11.96V
CL1 15A 15A 0A 130.1W/
119.5V 85.1% 0.981 36°C/
3.33V 5.02V 12.04V
CL2 0A 0A 55A 663.3W/
117.9V 90.4% 0.993 26°C/
3.34V 5.03V 11.97V

Go on. Pick up the nearest dictionary and look up "rock solid." Did you see a picture of this unit next to the entry? You should have, because once again Seasonic is just killing it for voltage stability. 0% regulation on both minor rails. Wow. And look what it takes to get those rails to even move a little bit... you need to throw the whole 125 watts of combined maximum on those two rails to do that.

Not impressive enough for you? Go back and look at the low load test. Yes, this thing did 0% regulation on the minor rails from 10-100% loading. Still not impressive enough? Look at the 12V numbers. 0.8% regulation, there. And that's not just in the main series of tests, no. That would already be incredibly impressive. This bad boy is giving you that 0.8% number on all the tests I've done so far. Heavy 12V crossload? Still within 0.8%. No 12V load at all? Still within 0.8%. Low load test? You guessed it... still inside that 0.8% number.

Tell me you're not impressed yet. I dare you. Do it, so I can have you look at the efficiency numbers next. 80 Plus Platinum requires tests one, three, and five to hit 90%, 92%, and 89% respectively. Do you know how hard that is, to get a clean pass for Platinum on my power meter? It's so hard that it made it necessary to implement my 1% error tolerance rule, just so any units would pass. I can't afford the ridiculously expensive power meters 80 Plus uses, so mine tends to err on the side of ever so slightly over-reporting power draw. This unit... this fantastic unit... pretty much pole vaulted over my requirements for the Platinum mark. Forget the 1% rule, it doesn't need it. In fact, this may be the first unit I've ever tested to stay above 90% throughout all five progressive load tests.

Now, about the fan. I ran the unit in semi fanless mode for the cold testing, just to see when the unit would decide that the fan needed to come on. In the above table, you'll see an asterisk by the temperatures whenever the unit completed a test in fanless mode. This bad boy only turned the fan on in tests five and CL2. Want to know what was really eye popping about that? This power supply wouldn't run the fan continuously on those tests. It wasn't getting hot enough. You heard me right... at full power, the unit wasn't hot enough to apply continuous power to the fan. I had to sit there watching the thermometer like a hawk, because the numbers wouldn't stop bouncing around. The fan would speed up, the exhaust would cool off, the fan would spin down, it would heat up again... it did this over and over.

I don't know about you guys, but this power supply is incredibly awesome so far. Let's go to the next page and see if it can still be awesome when the hot box gets at it.

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