system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is a computer with 2 or 4 fast processors better than one with 100 or 1000 slow ones?

EDIT: Thanks for the answers.  I learned that GPUs *are* many, many specialized processors.
gpt
It depends on your needs.

If your task can be split up into many smaller parts and processed without care of other pieces, then you can use 10000 cheaper smaller CPUs.   This is the basis of distributed computing.