Who said anything about APM only being used by laptops?
Posted Apr 3, 2011 20:08 UTC (Sun) by giraffedata
In reply to: Who said anything about APM only being used by laptops?
Parent article: Powering down APM
I wonder how soon you would recover the cost just from energy savings.
Back when I replaced my Pentium 100 + access point combo ... with a WRT54G ..., I figured it'd be about half a year to a year.
The accountant in me has to point out that this (time to recover the cost) is not the proper measurement here. The proper measurement is the present value of all the electricity savings for all time minus the cost of the new hardware.
My company once looked at replacing CRTs with LCDs for the energy savings and did the calculations based on time to recover dollar cost and found it would get its money back in 3 years. Since we planned still to be in business in 3 years, it was said to be a good deal.
But I redid the calculations and showed that the electricity for the remaining life of the CRTs was cheaper than the price of the LCDs. That's because to buy the LCDs, the company would have to reduce its investment in its core business, thus reducing its income by more than the cost of the electricity.
And of course, one assigns a value to the finite labor and hassle involved in changing to a whole different router model, which for me pretty much always exceeds the present value of electricity saved.
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