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Politics : Formerly About Advanced Micro Devices
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To: Mani1 who wrote (98213)3/13/2000 9:27:00 PM
From: THE WATSONYOUTH  Read Replies (1) of 1572739
 
Re: "The 60 deg C max die temp is the lowest I have seen for a PC CPU, it is hard to do and I am sure there is good reason for it."

The most likely reason is performance. It is very hard to believe that the part is not reliable at 85C. For Al BEOL, you see approximately .37% decrease in resistance per degree C. So for 25C lower temperature, you would see about 9% lower BEOL resistance. This probably translates to about 3% overall performance increase. Remember, when Intel decided to stay with Al, they had to carefully redo the layout of all the critical paths in the BEOL in order to not be BEOL limited. (They admitted as much) In addition, the 25C decrease in junction temperature probably adds about 2.5% performance from a device point of view. Also, it probably buys them .05V to .1V in gate oxide reliability which allowed them to increase Vcc to 1.7V for 20A gate oxide. Overall, they probably got about 7% performance increase or about 70MHz. The trade off is the the more expensive/complicated heat sink which looks like they will need some kind of plenum to draw air thru to achieve this temperature. Wonder what the box makers think?? The intriguing question is: Did Intel have to do this just to squeeze out 1 GHz??? (IF) so, I don't know what else they could do to go higher with this design other than additional improvements in device design.

THE WATSONYOUTH
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