Reviews - Silverstone Zeus ZM1200M 1200W
Sample Provided by: SilverStone (By OklahomaWolf on Sun, Aug-17-2008)

Page 2 -

Once more, we come to the main course of the meal, the load testing. This will be accomplished using the same equipment at the same load levels as the ZU1200M, because technically they are the same platform. I will be testing this unit with it set to single 12V@95A mode.

For those new to these reviews, I use a SunMoon SM-268 automated test environment to load down these things. There are five presets on the front of the machine, and I'm going to program them for a progressively increasing load on the unit ranging from 20% to about 90% of full load. Why not 100%? Simply put, the load tester is not capable of fully loading units this powerful. So, I'm just going as high as I can, keeping in mind the combined load limits from the table on page one. When the progressive tests are done, I'll do two more, crossloading the unit towards unbalanced loads that will truly test the unit's ability to regulate voltages.

Finally, I'll repeat the whole shebang with the unit locked in a hot box of my own devising. You know, it's kind of hot in the lab today... I better go get the desk fan in case that hot box gets too out of hand.

Results - Silverstone ZM1200M COLD load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. Intake/
Exhaust
Simulated system load tests
Test
1
4A 4A 14A 223W/
276W
81% 24°C/
30°C
3.36V 5.05V 12.48V
Test
2
8A 8A 28A 427W/
494W
86% 24°C/
33°C
3.36V 5.05V 12.45V
Test
3
13A 13A 43A 648W/
752W
86% 25°C/
39°C
3.32V 5.01V 12.39V
Test
4
17A 17A 57A 844W/
995W
85% 26°C/
43°C
3.29V 4.98V 12.34V
Test
5
21A 21A 71A 1061W*/
1259W
84% 26°C/
55°C
3.27V 4.95V 12.31V
Test
CL1
21A 21A 1A 198W/
287W
69% 26°C/
45°C
3.32V 5.01V 12.49V
Test
CL2
1A 1A 71A 888W/
1017W
87% 26°C/
52°C
3.33V 5.03V 12.34V

*calculated load - out of SM-268 display range

Well, color me shocked. The ZU1200M, if you will recall, was a bit lackluster in efficiency. Not so for this bad boy. While there is one very uninspiring reading up there in test CL1, the best we get is 87% which is amazing. Maybe they tweaked the design a bit. You will notice that there is an asterisk next to the DC load in test five... this is because I usually obtain these readings from the calculated result displayed by the SM-268. And, it cannot display values over 1000W. So, the number there is calculated by me based on the voltage readings and current settings of the test, which includes a 0.4A load on the -12V rail and 2A load on the 5VSB rail.

Sadly, this unit does share one thing with its non modular brother - it is not able to hold 1% regulation. It does hand down better than 2% results though, which is still quite good. Can't fault it too much for that. What's really interesting is the high 12V reading, nearly flirting with the upper end of the 5% spec. This is almost higher than I like to see this rail, especially in tests one, two, and CL1; however for those who are really looking to stress this unit the voltage reading still stays well above mean value. There are overclockers out there who prefer to adjust this rail to a higher than normal value like this to aid in overclocking, and this adjustment is not necessary (or maybe even possible) in this unit.

The two crossload tests show, just like the ZU1200M, that this is an independently regulated design.

Fan wise, I heard some noise from it in test three already, so it's about as quiet as the ZU1200M is. Maybe a bit louder, due to the rear fan placement in this one. Let's go to the hot box.

Results - Silverstone ZM1200M HOT load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. Intake/
Exhaust
Simulated system load tests
Test
1
4A 4A 14A 223W/
276W
81% 31°C/
37°C
3.35V 5.06V 12.48V
Test
2
8A 8A 28A 427W/
494W
86% 37°C/
42°C
3.33V 5.04V 12.44V
Test
3
13A 13A 43A 648W/
750W
86% 45°C/
54°C
3.31V 5.01V 12.38V
Test
4
17A 17A 57A 849W/
996W
85% 42°C/
62°C
3.28V 4.98V 12.33V
Test
5
21A 21A 71A 1062W*/
1259W
84% 45°C/
71°C
3.26V 4.95V 12.28V
Test
CL1
21A 21A 1A 198W/
288W
69% 36°C/
53°C
3.32V 5.01V 12.48V
Test
CL2
1A 1A 71A 888W/
1019W
87% 41°C/
62°C
3.32V 5.02V 12.33V

*calculated load - out of SM-268 display range

I hear you asking what's up with the temp readings. Well, it's quite simple - the lab's ambient temperature, usually around 18 degrees, was already over 20 degrees when I started testing. By the end of the cold tests, the room had warmed up even more. And so, by the time test four hit on the hot box testing, the intake temperature at the power supply was already well over 50 degrees. You'll recall that this unit is rated to 50 degrees exactly. Rather than risking the inevitable meltdown and/or overtemp shutdown from trying to keep going as is, I pointed the desk fan at the hot box, waited for temps to re-stabilize, and got the remaining hot box readings.

Not too much is different about the numbers here. We get the same amazing efficiency results, which is likely due in no small part to the high 12V voltage readings, similar better than 2% regulation numbers, and the unit is having no trouble taking the heat. I likes what I sees.

Silverstone
ZM1200M

+3.3V

+5V

+12V

Test
1

Test
2

Test
3

Test
4

Test
5

Test
CL1

Test
CL2

Now this is what I like to see. You're looking at the extent of the ripple and noise in this unit, and as you can see by the big black spaces there isn't much of it there. The worst result here is 35mV or less, and the 12V output is so clean this unit is almost like the second coming of the Antec Signature SG-850. Only, the Signature wasn't this powerful. Hubba hubba!



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