[kwlug-disc] Cost of ancient vs. current CPU ...

[William Park]

In addition to cpu, I factored in the efficiencies of power supply, 
memory, hard disks, gpu, motherboard, and monitor.  Measured the actual 
current drawn, using AC current meter via 20x loop adapter I made.  I 
didn't need to measure it, I could tell by touching.

Also, ability to go into "idle" or "sleep" mode.  I remember, my old 
computer couldn't go into sleep reliably.

Regarding heating the room with computer... In summer, you have to run 
AC to remove that heat, so that 2x cost minimum.  In winter, you are not 
using cheaper gas, so that's opportunity cost.

Finally, I consolidated multiple computers into one.  That's the biggest 
saving.

On 2025-07-31 05:09, Ronald Barnes via kwlug-disc wrote:
> Khalid Baheyeldin wrote on 2025-07-30 16:59:
> 
>> Let us compare the two 'ancient' CPUs that are mentioned in that
>> other thread (AMD FX-8320 and Phenom II X6 1090T vs. a current
>> desktop CPU, an <https://www.cpubenchmark.net/
>> compare/1782vs393vs6029/AMD-FX-8320-Eight- Core-vs-AMD-Phenom-II-
>> X6-1090T-vs-AMD-Ryzen-5-PRO-8600G> AMD Ryzen 5 8600G <https://
>> www.cpubenchmark.net/compare/1782vs393vs6029/ AMD-FX-8320-Eight-Core-
>> vs-AMD-Phenom-II-X6-1090T-vs-AMD-Ryzen-5-PRO-8600G>).
>>
>> The TDP for the former two is 125W, and the latter is 65W.
>>
>> If I plug in my cost for hydro ($0.11 before tax), and assume the 
>> desktop is powered 24/7 at 25% load (say it is a home server for
>> example), the difference per YEAR is ... wait for it ... a whopping
>> $14.48!
>>
>> That is $1.2 per month, which is really negligible if dollar cost
>> was the only factor.
> Thanks Khalid, for running these numbers.
> 
> 
> Exactly my perspective here - electricity costs are negligible, the 
> source is carbon free, and in the winter it saves on natural gas heating 
> (a little bit).
> 
> 
> Once the new Ryzen 5 9600x arrived, it's worthwhile to have the old 
> machine running still just to provide server duties that don't reboot as 
> often as a desktop.
> 
> 
> That $15 / year is pretty eye-opening and reassuring.
> 
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