Greetings once again, good readers. Once in a while, we sometimes like to take a look at products a bit outside the usual ATX suspects here at jonnyGURU.com, and today is going to be one of those times. Seasonic has sent me their SS-300TFX unit today, a 300 watt TFX based unit intended for small form factor cases, and I intend to see just how it does.
Most of my reviews start off with a few box pictures. Not this time. This unit didn't come inside a retail box to show you. So, we'll start off by looking at the unit itself. Unlike most full sized units I've been testing lately, this unit comes in the plain old drab gray metal enclosure power supplies used to come in, before they were all done up with bling bling, yo dawg, what, what, paint jobs and fancy packages. It's somewhat refreshing to see, in a way, like that one Madonna song squished in there on the radio between all the Lady Gaga songs.
Here's the unit from another angle. That's an 80mm low profile fan on top there, by the way.
Here's a better look at that fan. The grille, despite being a stamped affair, is pretty unrestrictive as punched fan grilles go.
An extreme close-up of the exhaust end of this unit. There's just enough grille space to get the hot air out, but one wonders how effective such a small grille area will actually be. We'll have to find out in the load tests.
Finally, a look at the extremely dull bottom of the unit. You can easily see where the standoffs for the internal PCB are mounted, as well as the standoff for the ground wire.
And here's the label. As you can see, this unit is 80 Plus Bronze rated, a claim we'll be testing on the next two pages. Combined 12V power is given as 252 watts, or 24A. That's not a lot, but what more can one expect from a small form factor unit that weighs in at 300 watts soaking wet? Fair warning to those with old 5V based motherboards... that combined 110W 3.3V/5V is way too light to power your board. You definitely want to run a modern 12V based motherboard with this supply.
5VSB is also a bit light, at a mere 2A rating. Most full size units come in at 3A on this rail. I would actually like to see this rail beefed up a little bit.
Say goodbye to sleeved cables with this unit, as this unit doesn't have such a feature. Once again, this unit goes retro, with the plain old multicolored spaghetti treatment on the wires.
Type of connector:
ATX connector (340mm)
4 pin ATX12V connector (440mm)
5.25" Drive (300mm+150mm)
3.5" Drive (+150mm)
Unit Dimensions(L x W x H)
74mm x 85mm x 63mm
Peripheral support on this unit is limited, which is often the case for small units like this. You can have four SATA devices, two Molex equipped devices, and one that takes a 3.5" floppy connector and that's about it. And they all have to be relatively close to the unit, as the cable lengths are all chosen with small cases in mind.
You may be asking yourself why I didn't put the rail distribution in the above table. Well, there's a good reason for that. Upon opening the unit for verification, I found that it only has the one 24A 12V rail.
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