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Politics : Formerly About Advanced Micro Devices

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To: Scumbria who wrote (58326)	5/16/1999 11:44:00 PM
From: Paul Engel	Read Replies (2) of 1577865

SCUMbria - Re: "I hope you are kidding." No - 60 WATTS is a reasonable estimate. The Kmart 63 dissipates 29.5 watts at 450 MHz. A "simple" ratio of frequencies : 500/450 would predict 32.7 watts at 500 MHz for a Kmart 63. Next, let's take a ratio of "active" transistors - ignoring the caches. We will assume a very simplistic argument that power dissipation is proportional to the total number of active logic transistors. Remember - the extra STAGES in the K7 pipes add a LOT of extra switching transistors ! The K7 and K63 have about the same TOTAL number of transistors - 21 million. Stripping out the CACHE transistors (256K + 64 K) for the K63 and 128K for the K7, that leaves about 14.8 million for the K7 6.14 million for the K63. This is a ratio of 2.4 to 1 - "active" logic transistors only. This extra transistor count could increase the power dissipation 2.4X - on average - from the K63 to the K7. 2.4 x 32.7 = 78 WAtts ! Thus, 60 WATTS is not FUD - it is a reasonable LOWER BOUND ESTIMATE for the K7 power dissipation for the K7. Do you have a BETTER ESTIMATE ? Paul

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