Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 241.28

-2.0%

1:08 PM EST

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To: Dan3 who wrote (74596)	3/15/2002 8:27:26 AM
From: Joe NYC	Read Replies (1) of 275872

Dan, Hit rates will vary with code and data, but Athlon will have a substantially better hit rate than P4. Doubling the "wayness" of a cache is roughly equivalent to a 2 to 3 times size increase, so Athlon's 384K cache performs about as well as P4 with 750K to 1Meg cache. Which is probably the main reason Athlon does so well in server applications. This part is something I am a little dubious about. You mentioned that Athlon can store more locations, but given smaller total cache, each location can store less data. There may be cases when you many locations to be cached (I guess heavily multithreaded application, but there are times when you don't, and having more data sitting in the cache will be an advantage. I don't know where the trade-off is in real world applications, but my guess is in benchmarks, when usually a single task is being measured, P4 with more total L2 has an advantage. Joe

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