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To: Dan3 who wrote (53338)8/31/2001 1:35:31 AM
From: TenchusatsuRead Replies (1) | Respond to of 275872
 
Dan, <Think of a 6 cylinder engine and a 9 cylinder engine.>

Then you'll love Merced's nine-cylider engine and McKinley's eleven-cylinder engine.

Tenchusatsu



To: Dan3 who wrote (53338)8/31/2001 2:04:51 AM
From: wanna_bmwRead Replies (1) | Respond to of 275872
 
Dan, Re: "P4 has 6 execution units and Athlon has 9."

Actually, the Pentium 4 has 7 execution units, and two of them are double pumped. But besides, listing the number of execution units is a poor way to measure performance, since they are used so terribly inefficiently in x86 design. You are lucky to get three of them functioning in a clock cycle, and that goes for both Pentium 4 and Athlon. The reason they build so many is to cover all the bases. Out of your typical max ILP of 3 instructions per clock cycle, are they going to be floating point? Integer? Memory accesses? A mixture? The same idea is behind EPIC, but then you have the compiler guessing for you, which is usually more accurate than your typical reorder queue.

wanna_bmw



To: Dan3 who wrote (53338)8/31/2001 8:10:59 PM
From: Dan3Respond to of 275872
 
Re: Think of a 6 cylinder engine and a 9 cylinder engine

And there is also the fact that, while it runs internally at the advertised clock speed (parts even faster), P4 runs code (reads in instructions) only every other clock. So the speed at which a P4 runs code is actually half its advertised clock speed. A fact that Intel has been pretty quiet about.


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