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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 206.14-4.1%Nov 25 3:59 PM EST
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To: pgerassi who wrote (73888)3/7/2002 1:43:19 PM
From: dale_laroyRead Replies (1) of 275872
 
>Athlon has 10 stages and runs just fine to 1.8GHz and now he thinks that Clawhammer needs 18 stages to get to 1.8GHz. He is soundly mistaken since Athlon gets to 1.73GHz with just 10 stages and adding 2 more at 0.18u would get it to 2.07GHz assuming it is at least as well balanced as Athlon. With 28 stages, P4 at 0.18u only got to 2GHz or 70MHz a stage. He must think AMD can not do as well as it has proven to. Otherwise, he would have to admit how badly he and Intel were mistaken by their poor design decisions.

The real reason Intel needs those repeaters (or boosters if you like that term better) is that they are trying to have 50% more clock on a chip twice as big. That means that they need two stages to move data around while AMD only needs one. This shows that the high clock solution does not work beyond a given point and 28 stages is far beyond that point for general purpose computing.<

Up until Intel started with the P4, the industry consensus was that optimum performance would be achieved with a pipeline of between 8 and 12 stages, depending upon the complexity of the ISA. Longer pipelines could lead to higher clock rates, but the cost to IPC would negate this increased clock rate.
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