cant find 150W - 200w power supply

[124bfg]

Hello,

I cannot seem to find a ATX 150w to 200w power supply anywhere..
I have looked on amazon and ebay.

I am building a pfsense router/firewall. The whole system will draw around 90w under load.

So my question is:
Can anyone help me find a 150w to 200w power supply that is from a decent manufacturer (no cheap chinese PSU)?

Thanks

 

[greens]

https://www.amazon.com/picoPSU-160-XT-DC-DC-Power-Converter-Module/dp/B005TWE6B8

little pico psus will convert DC laptop bricks to ATX DC connections...

That said you could put a 1000W in there and its not like its gonna draw more than the PC needs.
Just get an efficient power supply that is cheap, it won't consume any more power than a PSU rated for less W.

 

[scout_03]

see these small form factor atx psu https://www.newegg.com/Product/ProductList.aspx?N=100007657%20600014001%20600014014&IsNodeId=1&Submit=ENE

 

[124bfg]

Thanks for the replies.

I thought a higher wattage PSU than a system need will cause the psu to be less effiecent?

 

[greens]

Er well yeah but not like that.

A 500w PSU might eat 550w of power. A bit of loss there. It consumes a bit more than it gives.

That same PSU running at 100W may use 150W of power. Same 50w loss but the loss is a higher % of total output and therefore it is less efficient.

Hope that makes sense

 

[124bfg]

Yeah it does, thanks.

Basically, I am using this http://www.asrock.com/mb/Intel/Q1900M/ with a usb drive or an SSD to make a low powered router. I want it to be as low power and efficient as possible. Will using a 450w psu increase the power consumed then?

 

[greens]

Yeah it does, thanks.

Basically, I am using this http://www.asrock.com/mb/Intel/Q1900M/ with a usb drive or an SSD to make a low powered router. I want it to be as low power and efficient as possible. Will using a 450w psu increase the power consumed then?

Not by much. Really it boils down to the power supplies efficiency at that output.
If you get an 80+ gold/silver/bronze certified PSU you'll be good.
Those certified PSUs are tested at 20% load, 50% load, and 100% load. They must be 80% efficient at each point in order to get basic certification, better efficiency gets them better ratings starting at bronze.

So a 450W PSU, which has been 80+ certified, will have been tested at 20% (90W for a 450W) and will have proven to been 80% efficient or better - consuming somewhere between 90 and 108W of power.

This is why i'd rather you get a highly rated PSU from somewhere like Seasonic, versus a terribly rated liteon PSU that has a peak output closer to your needs - in reality the higher quality PSU will be the winner in regards to efficiency at low loads.

 

[Eximo]

Have you looked into a motherboard that takes DC input via a 12V plug? Since you are using an embedded processor anyway you could just get one powered by an external brick.

Hmm, that was easy:

http://www.asrock.com/mb/intel/q1900dc-itx/

 

[124bfg]

No I havn't.

The only problem with that motherboard is the lack of pcie express lanes (for NICs) and full length ram..

Are there any cheaper embedded low power quad core 2.4ghz cpus?

 

[Eximo]

Probably not going to be many DC powered powered boards with PCIe lanes. If they stick to the standards that would end up being a pretty big brick.