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Politics : Formerly About Advanced Micro Devices
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To: Kiriakos Georgiou who wrote (2687)11/5/1996 3:22:00 PM
From: David Williamson   of 1583275
 
This isn't really stock related, it's just a note to those interested in calculating speedup:

I've seen several notes in here discussing processor speedup. Note that going from 100Mhz to 200Mhz with the same chip (i.e. Pentium or whatever) is NOT 100% speedup. It would be if the system bus and all the other system components also doubled in speed, but this is not the case.

Example: The 100Mhz pentium uses a 66Mhz bus. Therefore, the processor clock is 1.5X the bus clock. The 200Mhz Pentium also uses a 66Mhz bus, so its processor clock is 3X the bus clock. This is significant since whenever you need to fetch data or instructions from memory (i.e. whenever you miss in the on chip cache), the latency on the 200Mhz part will be twice as many clocks. Because of this the speedup is NOT linear even for the same part.
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