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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 200.98+1.4%3:59 PM EST
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To: RDM who wrote (2830)7/29/2000 12:24:56 AM
From: ScumbriaRead Replies (4) of 275872
 
RDM,

Longer pipelines deliver higher clock rates, though there is an optimum length after which you start getting diminishing returns.

The penalty for a longer pipe is fewer instructions executed per clock. The reason for this is that events which cause the pipeline to flush (branch misprediction, interrupts, etc.) take longer to recover from with a deeper pipeline, resulting in a lower average IPC (instructions per clock.)

Performance is measured in MIPS (millions of instructions per second.) This is calculated as:

instructions/second = instructions/clock * clocks/second

Generally speaking, a deeper pipe produces more MIPS, though it appears that Intel may have deepened the pipe past optimal on Willy (28 stages.)

Scumbria
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