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Politics : Formerly About Advanced Micro Devices
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To: Petz who wrote (27679)1/5/1998 10:26:00 PM
From: Yousef  Read Replies (1) of 1572716
 
John,

Re: "If you follow this thread back to where it started, increasing Vcc is exactly what I was talking about ..."

John, I followed the thread back ... and what started this discussion was
your incorrect statement:

"Since power consumption generally increases as the square of frequency"

Remember, Power ~ CV^2f ... C=Capacitance, V=Voltage, f=Frequency

The correct statement is if you increase voltage AND frequency then the
power will scale as V^2f (more than just the square of the voltage).

Re: "AMD's 0.25 generation has apparently physically shrunk the FET by
more than the expected (0.25/0.35)^2 ratio, judging by the die size.
This is why I believe AMD will catch up to Intel on CPU speed instead
of being 2 speed grades behind."

This statement is very false ... AND needs to be corrected immediately!!
The fact that AMD has a more dense process does not mean the AMD FET's
are "smaller" than the Intel FET's. The size of the FET (electrical
gate length) and gate oxide thickness are limited by the oprerating
supply voltage. Thus, Intel actually has smaller FET's that give the
same drive current (Idsat) as the larger AMD FET's. The reason that
the AMD process produces smaller die is due to tighter design rules
(spacings between poly lines and contacts, contact enclosures ...).
These design rules only affect density and not FET size/performance.
Your assertion that performance is affected is totally wrong ... and misleading.

BTW, AMD's .25um process is optimized for 2.2V supply voltages (as reported
in the literature). As AMD lowers the supply voltage down to 1.8V for mobile
notebooks, the performance will fall of very quickly. Notebook K6's
in .25um process at 1.8V will not be running at 300mhz. They will be
lucky to hit 233mhz.

Make It So,
Yousef
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