Processor is the chip that executes commands and is at the heart of computing. It gets very in depth but generally the faster the core the faster it will be able to process instructions as I say there are so many more variables/manufactures than that I.E FSB speed etc.

Think of it as a car engine, a larger capacity will be able to displace a higher capacity of air/fuel and hence will be more powerful than an equivalent smaller capacity, however a smaller capacity forced induction engine may be able to displace more than the larger N/A engine. Thinking the same principle two cores for example in the computing world with a slower clock speed can be faster than a single core with a higher speed if you can think of it that way.

As said ANY Windows 32 bit OS can not address more than 4GB memory, however the architecture of most general system boards don't allow for more than this anyway.

Martin