Seasonic X-Series SS-460FL: 460 Watts of Fanless Power
by Martin Kaffei on October 20, 2010 12:01 AM EST- Posted in
- Cases/Cooling/PSUs
- Seasonic
- PSUs
- X-460
- Fanless
Internals
Seasonic uses the same basic design as previous X-Series models, but there are some changes in the details. Of course, you don't need two main caps for reaching 460W and a long hold up time. A cap with 390µF is more than enough and Seasonic has chosen a nice Nippon Chemi-Con device; there are more Nippon Chemi-Con caps on the secondary side.
You can see the heatsink for the VRMs and larger ones for all the semiconductors. The inlet filtering is extensive as always and the PCB is placed near the entrance to get an improved electrical isolation. The fan regulation is completely removed and the PFC-controller now sits on a sister-PCB as a THT-component, but there are still many SMDs (Surface Mounted Devices). A PS223 offers the safety functions on the secondary side. including OCP.
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Haravikk - Friday, December 27, 2019 - link
Don't know why I never posted a comment sooner, but I got one of these ages ago, and it's still going strong over six years later.It's been used in two different builds now, and currently in use for a small form factor gaming PC, in a Rajinteck Metis case, which mounts the full-sized ATX PSU vertically at the front. While I'm not going fanless, this arrangement actually works really well for this PSU, as my CPU cooler is able to draw air in through the PSU before exhausting it out the back, which is fine, as with the PSU's high efficiency it doesn't generate much heat at all, and I have just a single fan cooling everything currently in my system, making it nice and quiet.
In future I'll be adding discrete graphics (I've gotten a lot of mileage out the Ryzen with Vega's onboard GPU so far), so that'll be a second fan, it will also be pulling air through the PSU and exhausting it at the back, so I don't expect any issues. Plus the PSU easily gives me the headroom for that.
In such a system as PSU with built in fan would either starving the interior of the case of air (by pulling from inside) or pushing air into a tiny case that only really needs a good exhaust fan to guarantee good airflow.
Sure, it was a hefty price tag for minor benefits, but I've been pleased with it, and will buy fanless again if I can get one to the same high standard (or better).