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Politics : Formerly About Advanced Micro Devices
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To: Ali Chen who wrote (75741)10/18/1999 5:17:00 AM
From: Bilow  Read Replies (1) of 1572536
 
Hi Ali Chen; Great post on the AMD versus INTC process difference. My buddy who designs way too many ICs, (I mostly stick to FPGAs,) tells me that AMD has always had a better process.

I agree with your calculations re the AMD performance improvement, except for a minor detail. You didn't include the effect of adding in those extra flip flops. So technically, since the Intel design has more stages, you need to subtract the (average per pipe stage) time delay of these flip flops. This would be 6 * (Tsu + Tckq) / 11. This will reduce the advantage of the AMD process from 100% to maybe 50%, my guess.

In addition, it is almost always impossible to exactly split logic between several register stages. Because of this, designs with long pipelines tend to be somewhat less efficient. My guess is that this will reduce your calculation of AMD's advantage to (my guess) 30% range. I think this advantage is more likely to be the speed difference between the two companies.

There is always the chance that Intel will catch up on process. This could reduce the AMD advantage.

But the basic fact is that Intel has almost always had much better processor design, and this is no longer the case. We are going to see a revolutionary change in market leadership over the next few years. (Not all of which will be to AMD's advantage, but all of which will be to Intel's disadvantage.)

-- Carl
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