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Politics : Formerly About Advanced Micro Devices
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To: Tenchusatsu who wrote (39827)10/21/1998 9:37:00 PM
From: Maxwell  Read Replies (2) of 1579136
 
Tenchusatsu:

<<Then why isn't there a K6-2 version for mobile computers? I remember being told that the K6-2 has a high leakage current. I guess that says nothing about the K6, but it's still hard for me to believe that the cores in the desktop and mobile versions of the K6 are identical, and that the only difference is the package.>>

For a give process the Idsat (saturation current) and Idoff (leakage
current) are fixed. The Idsat and Idoff are related in the universal curve. The higher the Idsat the higher the Idoff. The higher the Idsat the faster you can make the chip runs (higher MHz). Low
Idoff is good in mobile because of low power dissipation while in
idle state. In active mode the amount of power dissipation is strongly
depended on the chip architectural design. If you compare the PII and K6-2 the PII has higher power dissipation at same frequency and
same Vcc. It is interesting to note that PII-300MHz at 1.8V dissipates about 8-9W while the K6 mobile at 300MHz of Vcc=2.1V dissipates only ~6W.

The bottom line is that the notebook has a thermal envelop of about 8W-10W. Low leakage is good but not a prerequisite. The most important thing is how much the CPU dissipate while it is active.
Low Vcc is good since Power=C*f*Vcc^2 where C=total capacitance
and f=frequency.

There are many notebook vendors which use just PGA K6/K6-2 for their
notebooks. Special packaging only reduces footprint.

Maxwell
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