Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Tenchusatsu who wrote (50828)	2/24/1999 1:49:00 PM
From: Elmer	of 1576094

Re: "I think Socket 7 processors can do multiprocessing, if you have chipsets and motherboards to support it. I don't think anyone really pursued it, though. I don't know anything about the Socket 7 bus protocol, except that it's transaction-based (duh)." Actually I would call it cycle based where each memory/IO access locks the bus until it's completed. A transaction based protocol has a means of identifying the transaction by ID# and the agent it belongs to. This is how transactions can be completed out of the order they were issued. (I know I'm not telling you anything you don't already know, but others might like to understand). Socket7 has no such capability. There are some Socket7 dual processor boards out there but they only work with Intel processors. Intel holds the patent on the APIC Pentium uses and AMD/Cyrix processors don't conform. AMD and Cyrix jointly defined their own APIC protocol but because of the poor Socket7 performance nobody bothered to use it. EP

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