I don't think it's that useful to know specific numbers, but knowing the orders of magnitude is important when you're writing anything even somewhat CPU intensive. It helps you understand why certain patterns of code are slower.
I sense a bit of humor in your comment, but none the less its worth learning.
In the end, the CPU is the actual machine that runs the code. It's good to have an idea about how it works because it clears away a lot of the smoke and mirrors that abstract VMs use in defining their behavior.