LogFAQs > #921825519

Short answer:

Multiple cores is basically a way to get around the problems with just making faster single core processors.

Namely, you get to a point where making it faster increases power use and heat generation, and also to where you can no longer miniturize it any further without running into fidelity issues simply due to quantum mechanics being annoying (whether in just the etching/creating process, or in the function of the chips themselves).

To put it another way though:

What you are asking in the topic title is literally what they already do for the most part. Just about any half-baked program made by people who don't know how to multi-thread will typically run on the first core only. This is more an OS issue from what I can tell. That said, a modern OS may be willing to toss a single-thread program to a different core.

If you want this "main core" to be faster, then build a computer with an unlocked CPU, and then overclock the first core higher than the others.
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