A processor is more faster -
by a factor of 1000 or more.
Instructions
Absolutely! the more processor cores you have the more instructions the computer can handle at the same time.
The processor speed determines how fast a program runs. The more clockspeed a CPU has the faster it reads the instructions.
The best processor one would choose for gaming depends on the type of game. Different games have different processor speed requirements, but the faster and more advanced the processor the better.
Get more RAM and/or a faster processor.
A Pentium 4 processor is more advanced because it is faster and able to do much more complex calculations. It will, however, be superseded by a more advanced processor eventually.
At the same speed they likely use similar power, but as dissipating heat is easier in desktop it is more likely to use faster higher power processor.
controller performs its operations faster than processor because controller has memory in it so it takes less time cycles for fetching of address or data from memory where as in processor memory is connected externally so time taken will be more to perform its operations.
Yes, P4 is faster and more reliable.
It can make your brain faster and more logical.
Core 2 Duo will most probably be faster but a bit more expensive
Its needed because its faster, most programs need more speed to run, its better.