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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 205.23-2.3%10:51 AM EST
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To: Charles Gryba who wrote (53266)8/30/2001 6:14:06 PM
From: TenchusatsuRead Replies (2) of 275872
 
Constantine, <Thread, is this guy right or wrong about the instructions per cycle for the P4?>

Unfortunately, it all depends on what your definition of "instruction" is.

Clintonian wordplay aside, remember that all modern x86 processors translate native x86 instructions into internal micro-ops. If the author says that the Pentium 4 can process up to six instructions per clock, he is obviously referring to micro-ops. I think all x86 processors made by Intel and AMD these days can decode up to three x86 instructions at a time. Beyond that, the internal micro-ops differ from one processor architecture to the next. That's enough to disqualify the number of micro-ops processed per clock as a reliable measure of performance.

I won't even go into the effect of caches on actual performance, because that should have been painfully obvious to the author.

Tenchusatsu
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