Low power & high efficiency PSU

[Radium]

Hi!

 

I have a home server with low power requirements but a very noisy power supply. I've looked into replacing the fan which some have been able to do but I can't find a low profile low noise fan so I'm now looking into getting a different PSU. The board and CPU maxes out at around 45-50 watts and it's capable of connecting 12 drives. I'm planning on populating all 12 ports on it so I want a power supply that's capable of that and I would guess that under the worst circumstances (highest load possible) the drives would consume up to 60W and 5A. I need a power supply that's very quiet and can supply my server with enough power. I found Streacom Nano150 PSU but the amper

[The Evil Overlord]

400 watts, isn't too powerful, and you should be very happy with it, you mention it being pricey, but when moving from an item necessary, to an item more convenient, that does happen.

I'll throw in a vote for the seasonic 400 fanless.

[+PeterUK MVC]

What about a 520W fanless PSU?
http://www.silverstonetek.com/product.php?pid=481&area=en

Or the 400W
http://www.silverstonetek.com/product.php?pid=228&area=en

You will draw the amount power needed for what your powering so if something using less then 200W from a 400W PSU it will only use 200W and the efficiency to output that power is based on the 80 Plus certification for AC power in to DC power out.

[Psychosematic]

You don't need to worry about overspeccing. The power supply will only draw as much as it needs. So if you have 90w of components, an 800w power supply with 90% efficiency only draws 100w.

[Radium]

You don't need to worry about overspeccing. The power supply will only draw as much as it needs. So if you have 90w of components, an 800w power supply with 90% efficiency only draws 100w.

The efficiency is not constant, it peeks at around 50%. So using 5W from a 400W PSU is not ideal. Power efficiency at 5-25W isn't specified which is why I was bringing this up. The 80 Plus certification only says that the efficiency needs to be at least 80% at 20%, 50% and 100% load. Efficiency at low power use is rarely talked about since computers either use 0-1W when off or 50W+ when on. The machine that I'm using PEEKS at 45-50W which is why I'm asking all this.