figuring power efficiency with two power supplies

[ICE_9]

So this power supply states that it has over 95% efficiency.

http://www.mini-box.com/PW-200M-DC-DC-power-supply

The power brick, as far as I can tell, states that it has 90% efficiency.

http://www.mini-box.com/110w-12v-8-5A-AC-DC-Power-Adapter

Is it safe to assume that after looking 10% efficiency from the AC/DC power supply, and loosing 5% efficiency from the DC/DC power supply, the total efficiency is arround 85%?

 

[jonnyGURU]

Your math is good, but your source of numbers is not.

Linear power supplies don't have 90% efficiency. They're rarely even 80%. So I wouldn't expect that one to be any different.

 

[ICE_9]

The number I was using for the power brick came from here.

http://www.astec.com/Products/Display.asp?SeriesID=288

I know it isn't the same power supply exactly, but I wasn't sure how close they would actually be.

 

[jonnyGURU]

Wow. 90% typical?

We need to have someone test that.

 

[Farva]

Wow. 90% typical?

We need to have someone test that.

Like a certain PSU inquisitor?