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View Full Version : Suggestion for 100W silent PSU


lightman
02-17-09, 11:01 AM
Hi all,

I'm building a small Atom-based NAS for home, therefore, I need a small (100W or so), silent (and by silent I mean really silent), 80%+ PSU.

Any suggestion ?

ViN86
02-17-09, 11:27 AM
maybe something on this page?

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2000320058+113142551+1131310094&Configurator=&Subcategory=58&description=&Ntk=&SpeTabStoreType=&srchInDesc=

lightman
02-17-09, 01:04 PM
maybe something on this page?

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2000320058+113142551+1131310094&Configurator=&Subcategory=58&description=&Ntk=&SpeTabStoreType=&srchInDesc=

Too powerful (except maybe one at 145W), unknown brands, most with 80mm fans (a big no-no for silence). No way.

By the way, when I said small, I didn't mean in size, a standard ATX one would be good, as long as it's efficient and whisper silent.

Dreamweavernoob
02-17-09, 01:20 PM
I cant help much, but I know there is a Zalman PSU that is cooled only by heatpipes. Might be to many watts for you though :o

CaptNKILL
02-21-09, 02:46 AM
Why do you need 100W? Just get a good one that fits your needs. It'll only use as much as the system requires. In fact, a small load on a more powerful unit will make less heat and probably use less power than maxing out the weakest unit you can find.

Try this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104044

lightman
02-21-09, 05:41 AM
Why do you need 100W? Just get a good one that fits your needs. It'll only use as much as the system requires. In fact, a small load on a more powerful unit will make less heat and probably use less power than maxing out the weakest unit you can find.

Not completely true. If you look at the efficiency curves for any psu, you'll see that it starts low, rises up to to a maximum (usually around 70-80% of the maximum power), and then decreases again. ;)

So, given that the system will draw around 50-80W, it makes sense to get a 100-120W PSU, so as to make it work in the range of near maximum efficiency. Putting a 300W in that system would make no sense at all.

XDanger
02-21-09, 09:00 AM
picoPSU-120 DC/DC 12-25v Red (120 Watt) ?
http://www.minipc.de/image_db/image2.jpg
Would that work?

lightman
02-21-09, 09:47 AM
picoPSU-120 DC/DC 12-25v Red (120 Watt) ?
http://www.minipc.de/image_db/image2.jpg
Would that work?

With the 120W brick, possibly. Two problems: 1) Going by silentpcreview review, the fan in the brick is loud, though it only kicks in at 90W+, and I guesstimate the system to only draw some 60W or so, so it shouldn't be a problem (and I could go with the 80W brick), and 2) I'm not sure I can find it here in .it (yeah, it's a ****ty country, I should move as soon as possible)...

I think I will look into it...

XDanger
02-21-09, 11:52 AM
http://shop.ebay.it/items/picoPSU-120_W0QQ_nkwZpicoPSUQ2d120QQ_fromZR40

CaptNKILL
02-21-09, 02:07 PM
Not completely true. If you look at the efficiency curves for any psu, you'll see that it starts low, rises up to to a maximum (usually around 70-80% of the maximum power), and then decreases again. ;)

So, given that the system will draw around 50-80W, it makes sense to get a 100-120W PSU, so as to make it work in the range of near maximum efficiency. Putting a 300W in that system would make no sense at all.

Hmm... I didn't know that. :p

Anyways, check out some of the stuff at these sites:

http://www.logicsupply.com/
http://www.mini-box.com/site/index.html

I've used logicsupply before and they have good service.

lightman
03-15-09, 02:18 PM
Ok, I finally found something that fits my needs, I will go with an Apex MD-100 case, which includes a DC/DC converter (like the PicoPSU) and an external brick: http://www.apextechusa.com/products.asp?pID=158 (yes, the external brick is only 60W, but the internal DC/DC converted is rated at 80W, so, if needed, I will just get a new, 80W external brick)

I will fill it with an Intel Little Falls 2 board (Atom 330), 2GB of ram, two WD Caviar Green 1TB drives, and a 4GB usb pendrive for the OS (Linux).

The two Caviar will be RAID-1 in software, and the whole box will be my new NAS box ;)

I will post a build-it-yourself NAS review/tutorial as soon as I get ahold of all the parts :)