MadSci Network: Computer Science
Query:

Re: What makes a particular CPU faster than the another?

Area: Computer Science
Posted By: Lew Gramer, MIT S.B. Math (Theoretical)
Date: Mon May 19 15:43:55 1997
Area of science: Computer Science
ID: 862383232.Cs
Message:

Hi, Aresh, thanks for a great question! Sorry I took so long answering you, by the way. There are a few things that make one CPU faster than another. As you've probably already learned, a "CPU" is a chip consisting of millions of tiny electronic components called transistors, interconnected with one another by a complex web of tiny circuit paths or "wires". The electrical signals that run across those wires all move at basically the same speed under a given current. So, the shorter those tiny "wires" can be made, the less distance the current has to move, and the faster the computer! Also, if you can make those wires and transistors hold up to MORE current, then that circuit will actually operate faster - another way to make a faster CPU. Last but not least, there's a number called "capacitance", which is associated with all electronic interfaces - the LESS "capacitance" there is between two wires, or between a wire and a transistor, the faster the electronic signals will be able to flow, and the faster a CPU will be. Hope this helps! If you're interested in more details about how electrical engineers make CPUs *really* fast these days, please write back with more questions!

Lew Gramer


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