difference might be that a Raspberry Pi consumes < 10W.
An old PC draws easily 5-10 times more energy.
Depending on your location, the yearly cost of running a Pi is around ~10$. The big machine then 50-100$.
So energy wise, a small power efficient machine might be more expensive but the running cost could be lower.
An old PC draws easily 5-10 times more energy.
Depending on your location, the yearly cost of running a Pi is around ~10$. The big machine then 50-100$. So energy wise, a small power efficient machine might be more expensive but the running cost could be lower.