For older computers, upgrading the CPU alone is completely unnecessary.
If your computer is very old, after upgrading the CPU, you’ll likely end up replacing almost every other component anyway.
The CPU is generally paired with the motherboard, so once you replace the CPU, your motherboard needs to be swapped out as well.
And after replacing the motherboard?
The memory on your old board typically needs to be replaced too, because older RAM generations and frequencies are usually too low and incompatible with newer motherboards.
Additionally, the mainstream storage interface on new motherboards is M.2. While older SATA drives may still have a port, a faster M.2 SSD is what truly unlocks the board’s full performance.
As for the graphics card, decent budget options now cost only a few hundred bucks, so there’s no real need to keep using an ancient