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Politics : Formerly About Advanced Micro Devices
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To: Brian Hutcheson who wrote (2710)11/6/1996 10:24:00 AM
From: David Williamson   of 1583247
 
>why bother with calculating speed when Intel and PC mags give the >relative speeds in chart form.

Exactly! Actually, this was my point. There are a lot of factors at work that determine the performance of a SYSTEM, and these back-of-the-envelope speedup calculations generaly aren't very accurate. You have to make too many assumptions for it to be meaningful, especially if you're trying to compare two different architectures. So, the way to detemine speedup is to look at benchmark results for a benchmark that is most like the applications you use. Winstone is a pretty good benchmark that's meaningful to most PC users. (This is what is used to determine PR rating)

>Are you saying that Intel can't be trusted ?

Well, the only thing to watch out for is what SYSTEM was used. If you plug a Pentium into a $50,000 PC with 10MB of L2 cache, 256MB RAM, etc., your performance numbers will be skewed. The benchmark numbers obtained from real systems that peple can buy are the ones you want to look at.

(Of course, if your trying to speculate about the performance of parts that don't exist yet, which is probably common on this newsgroup, then back-of-the-envelope calculations will have to do. Just realize there's a good chance that some assumption you make will turn out to be wrong. Even the chip vendor doesn't really know the perfomance of his new chip until he has silicon.)
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