[Soekris] Power savings

[Poul-Henning Kamp]

In message <53d706300903031646k7cd8b8f8h23c27514724e396d at mail.gmail.com>, Bryan
 Irvine writes:

>I was thinking of getting one of these little guys in my house.  My
>excuse? Power savings over the existing firewall.  I remember seeing
>something a long time ago that compared the cost savings of a full
>desktop firewall and a soekris, and basically the soekris pays for
>itself within x amount of time.  I was wondering if anyone had a link
>to power comparisons.

The savings depend on your price of electricity, every watt you burn
24*365 will cost you:

	R * 24 * 365 / 1000 = P

Where R is your electricity rate in ${money} per kWh
and P is ${money} per year.

In my case:
	1.83 * 24 * 365 / 1000 = 16.030 DKR (= USD2.75 = EUR2.15)

A NET5501 seems to run at 4-5 Watts, whereas the typical old PC,
without monitor, will run at around 50-100 Watts.

A conservative savings is therefore 45W = 720 DKR (= USD125 = EUR97)

Optimistically you save 95W = 1520 DKR (= USD262 = EUR204)

But obviously, this varies a lot according to your electricity rate.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.