Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 214.87

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2:53 PM EST

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To: Dan3 who wrote (52694)	8/27/2001 10:36:37 PM
From: Tenchusatsu	Read Replies (3) of 275872

Dan, <The rule of thumb is that if you don't quadruple cache, don't bother. Taking P4 from 256K to 1 megabyte of cache would be expected to increase performance by 5%. Taking it to 512K would make a 2GHZ perform like a 2.05GHZ> Are you so sure about this, Dan? First, I've never heard of the rule-of-thumb that you just stated. The only rule-of-thumb that comes even close is the one which governs the relative sizes of two-level caches (4:1 ratio). Second, where do you get the notion that a P4 going from 256K to 1M would only increase performance by 5%? After all, a 2.0 GHz P4 is running at a 20:1 processor-to-bus clock ratio. Decreasing the L2 miss rate by even a small amount will have a marked improvement in performance. And third, you'll be unpleasantly surprised at the per-clock performance improvement Northwood has over Willamette. But hey, no one really needs that sort of performance until AMD can sell it for under $100, right? Tenchusatsu

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