Seventeam ST-550P-AM 550W Power Supply

Our last review featured an example of Seventeam’s higher powered PSU’s. Today, we take a look at one of that unit’s little brothers, the ST-550P-AM, which promises good performance at high efficiency.

SUPPLIED BY: Seventeam
PRODUCT: Seventeam ST-550P-AM 550W
PROD LINK: Seventeam’s current offerings.
PRICE: Not Available
Price is at time of testing!

Welcome, good people, to my latest opus of madness and mayhem. Today, I will continue along the power supply torturer’s path by taking a good long look at one of the lower powered offerings from Seventeam Electronics, the ST-550P-AM. How will it fare? Join me as I do my level best to make the “AM” stand for “all murdered.” Muahahahaha!

Seventeam ST-550P-AM 550W

As is the norm for us here at, we start off our adventure with a picture of a box. And a rather good looking one too, if I may say so. That little green leaf decal has little tiny words on it that indicate that the unit within complies with RoHS guidelines. The words are so tiny, in fact, that I required copious amounts of caffeine to un-cross my eyes. Hey, I’ll use any excuse I can find to get into the caffeine, thankyouverymuch.

Other highlights of this part of the box include a big “S.T.N.C.” logo, indicating that this model incorporates Smart Thermal and Noise Control, a certification or two, and the fact that the unit is, like most I have reviewed, made in Taiwan.

Now, let’s just hope that big fireball on the front isn’t the result of the truth in advertising people at work.

Seventeam ST-550P-AM 550W

Looking at the top of the Meatneves box, we can see literally no new information about this power supply that we haven’t already seen on the front. But, there is another fireball. Indeed, the rest of the box is similarly printed, complete with two more fireballs. Gulp. Don’t worry folks, I’m sure it won’t explode. Uh, I think.

Seventeam ST-550P-AM 550W

Unpacking the box reveals a rather no frills looking power supply with an equally no frills complement of accessories. There’s a power cord, a little bag of mounting screws, and one of those little bags of “this is not food” silica gel. No, I didn’t test the accuracy of that claim. This time.

The power supply itself was encased in bubble wrap, which amounts to the only shipping protection it had within the box. No frills power supplies need no frills packing material, apparently.

Seventeam ST-550P-AM 550W

Another view of the plain Jane gray-as-the-Saskatchewan-day power supply. A 120mm fan provides cooling on this model, and the lack of a voltage select switch tells us that either this unit has active PFC or is designed for a specific market. A quick glance at the label reveals which of these scenarios is the case.

Seventeam ST-550P-AM 550W

Hooray! 100-240V and 50-60Hz under the Voltage and Frequency headings means that this unit can auto adapt to the incoming voltage, which also means we’re talking active PFC here. Another RoHS leaf is found on this label, with the words in the logo just as hard to read as before. I think I need to uncross my eyes again. While I’m off doing that, here’s a lovely table:

Seventeam ST-550P-AM – DC Output
DC Output +3.3V +5V +12V1 +12V2 -12V +5VSB
28A 30A 20A 20A 0.8A 2.5A
Max Combined Watts 150W 480W 9.6W 12.5W

At a combined 40A, the 12V side of this unit is right in line with most modern 12V based units around this power level. And, just as common for a modern supply, the combined 3.3V/5V rating tells us we don’t want to be tossing this unit at an old 5V based mainboard. Or… do we? Some units with independent regulation have fewer objections to such treatment. But, that is for the load testing phase to tell us.

Seventeam ST-550P-AM 550W

The cables on this no frills unit are, surprise, no frills cables. The one exception is the partially sleeved main ATX cable; the sleeving of which ends around 2.5″ from the connector itself. Speaking of cables, here’s another table. It’s a cable table, Mabel!

Seventeam ST-550P-AM – Cabling
Type of connector:
ATX connector (455mm) 20+4 pin
2 x 3 PCI-e (420mm) 1
8-pin Xeon/EPS connector (420mm) 1
2 x 2 12V connectors (+145mm) 1
5.25″ Drive connectors (440mm+150mm) 6
3.5″ Drive connectors (+145mm) 1
SATA Drive power connectors (450mm+145mm) 2
Fan only connectors (thermostatically controlled 12V only) 0

Seventeam ST-550P-AM 550W

Before we turn the page to take a look at the load testing results, I couldn’t resist giving you all a peek at the warranty sticker. In finest Engrish tradition, it commands us to go out and breakage an invalid. I have to wonder though, isn’t that a bit redundant? Isn’t an invalid already breakaged by definition?