Unless you have a CPU from 2000, probably it's not worth the energy savings to have a new one produced:
> The report about the cost of planned obsolescence by the European Environmental Bureau [7] makes the scale of the problem very clear. For laptops and similar computers, manufacturing, distribution and disposal account for 52% of their Global Warming Potential (i.e. the amount of CO₂-equivalent emissions caused). For mobile phones, this is 72%. The report calculates that the lifetime of these devices should be at least 25 years to limit their Global Warming Potential.
When I upgraded 5 years ago, general mechanical failure without available replacement parts was the driving factor, but energy consumption was high on my list. A light laptop with a long battery life is something that never used to exist, and it definitely improves my quality of life. If battery life at a low weight cost doubles in the next 5-10 yrs I'll probably upgrade again even if the machine is usable.
> The report about the cost of planned obsolescence by the European Environmental Bureau [7] makes the scale of the problem very clear. For laptops and similar computers, manufacturing, distribution and disposal account for 52% of their Global Warming Potential (i.e. the amount of CO₂-equivalent emissions caused). For mobile phones, this is 72%. The report calculates that the lifetime of these devices should be at least 25 years to limit their Global Warming Potential.
https://wimvanderbauwhede.codeberg.page/articles/frugal-comp...
This is for consumer devices btw, probably not if you operate some server farm with high occupancy (steady load on all hardware)