Reviews - Seasonic X-400 V2 Fanless 400W
Sample Provided by: (By OklahomaWolf on Sun, Feb-24-2013)

Page 2 - First Look

The manual is like all other recent Seasonic manuals... very complete, lacking very little information.

Some words of wisdom from Seasonic. Seriously, just because you bought a fanless power supply, it does not mean that cooling is important to the unit. In fact, cooling is even more important than on a fanned power supply. Think about it... with no way to exhaust its own heat, the power supply just sits there getting hotter and hotter until something or someone else does something about it. Heat is still the enemy of electronics, whether a power supply has a fan or doesn't.

This is why, when I build a rig using a fanless unit, I always try to positively pressurize the case it's installed in. That way, the unit gets some airflow.

I also do this, as Seasonic clearly wants us to do with this unit. This is a sash I found around the power supply itself when I took it out of the black bag. With a fanless unit, you want convection to do most of the cooling for you. That means having the circuit board in the unit facing down, heatsinks facing up. Just like this sash advises. Heat rises, and you want it to rise away from the circuit board, not upwards into it.

The warranty sheet. One is glad that Seasonic is standing by these units for a full seven year period.


And there's our power supply, done in that lovely matte black I like so much.

Yup. Definitely a good looking unit, says me.

Here's the side that faces the outside of the case, and it's... oh, Seasonic. It's not like you to miss things.

What am I talking about? Remember that sash we found around the unit? The one that says this unit must be installed with the unit facing a certain way? Well... it cannot be installed like that in certain cases, because there is only one set of screw holes here. What do I mean by that? Say you have a case. And I have a case. And I have a straw that goes aaaaaaaaaaaaaaall the way across the room...

Sorry. Brain's a little weird again today. Let me put it like this: some cases have screw holes that allow the power supply to be mounted facing either up or down. Some do not. Some power supplies have threaded holes so that they can be mounted facing up or down. Some do not. This power supply has only the one standard set of threaded screw holes, while the earlier X-400 had the second set as well.

If you put this power supply into a case that has only the one set of standard PS/2 screw holes, like my hot box, the grille that Seasonic wants facing up? It will be facing down. Because that's the only way you'll be able to mount it in that situation.

That's going to cost some functionality scoring. When the previous X-400 did allow for this circumstance and this one does not, that's a step backward. And now I'm going to have to figure out a way to hot test this with the grille facing up, just because that's the way Seasonic wants things done with this unit.

A look at one of the side panels for you, with lots of grille space showing the primary side and PFC parts.

The other side. Again, lots of grille space.

This side up. No fan, of course. I can already tell that this is the same platform I've now seen twice in the version 3 revision of the X-650 and Platinum 660. That should mean some absolutely breathtaking stability numbers later.

Here's the label. I'll do up a table. Maybe rant at Mr. Fuji a bit for the chromatic aberrations he seems so happy to slip into images.

SS-400FL V2
3.3V 5V 12V -12V 5VSB
20A 20A 33A 0.5A 2.5A
Max Power
@ 35°C
100W 396W 6W 12.5W

This unit is rated to only thirty-five degrees at full power. That's actually pretty common for fanless units.

A look at the modular connector panel gives us a peek at the VRM behind yet more grille space.

This is the part where I show you the modular cables and velcro bag.

With the exception of the ATX cable, all of these are ribbon cables. Pretty much the same cabling we've already seen with this platform, only with differing connector count.

Cabling - Seasonic SS-400FL V2
Type of Cable Length from PSU
Modular Cables
20+4 pin ATX connector 600mm
4+4 pin EPS/ATX12V 650mm
5.25"+5.25"+5.25" 400+120+120mm
5.25"+5.25" 300+120mm
5.25" to 3.5" adapter 105mm
SATA+SATA+SATA+SATA 400+120+120+120mm
SATA+SATA 300+120mm
6+2 pin PCI-E 600mm
Unit Dimensions (L x W x H)
160mm x 150mm x 86mm

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