The most important thing to think about in choosing processors is cost performance – it is said very often.
How to think about it?
The most important thing we should remember is, the professor is:
A chip of 5mm x 5mm area costs 1000 yen.
“Processing power” is evaluated as a product of “algorithm” and “clock speed”.
“Algorithm” is like “cleverness”. It depends on processor’s architecture. RISC, CISC, Superscalar…they are common examples of architectures.
Parallel processing is effective, but it will be difficult to control too much processes together.
“Clock speed” is like “toughness.” Under the same architecture it depends on “CMOS technology (size of micro structure)” .
By the way, it is very difficult to type “architecture.” I have mistyped it many times.