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I have an i7-2600 prebuilt for my NAS— is idle most of the time, bought it for $100 4 years ago. Have pretty cheap power at like $0.12 per KWh, but again mostly idle so probably doesn’t cost much anyway.
I did lol at cheap kwh internet - sounds way better than talking energy costs
Lmao typo
Older desktops can have a somewhat hefty idle power draw due to the overall system consumption contributing more than expected, such as the southbridge. According to this old review of the i7-2600k, the system idles at 74w, which at $0.12 per KWh, would cost you roughly $77 per year. Though you might want to confirm that with a Kill-a-watt meter if you can (libraries sometimes lend them out), since I'm pretty sure that total system power chart includes a discrete GPU, so the real number for a GPU-less system is probably around 40 or 50w at idle.
If that is accurate, you could potentially replace your i7-2600 with a used Dell Wyse 5070 thin client from ebay for about $40 (in the US), and that idles at 5w, which would only cost you $5 a year at the same rate.
Older thin clients and laptops tend to have much better idle power draws compared to desktops. For other people reading this, if you're using a desktop for a low-power use case, it's probably worth finding out what its idle power consumption is and doing the calculation to determine if it'd be worth replacing it with a more efficient used thin-client or office mini-pc.
In Germany consumer power is something like 0.4 EUR/kWh, so economics of running power-hungry hardware might be different. Solar PV might change the equation once again.
Then you'll need to factor in the solar initial cost as well!
DIY few kWp solar payback is about 2 years.