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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: Charles Gryba who wrote (77146)	4/15/2002 3:36:30 PM
From: fyodor_	Respond to of 275872

Charles: SSE2 would be huge for a lot of those streaming benchmarks wouldn't it? I wouldn't count on it. There are several reasons why SSE2-optimization gives such a huge boost for P4 - and none of them really apply to the Athlon: - P4 isn't very good at x87 math, especially double precision. The same certainly cannot be said of the Athlon ;-). - P4 has a huge amount of available bandwidth to main memory, so the bottleneck quickly becomes the CPU - esp. when dealing with "expensive" instructions, such as those sped up by SSE2. Even though the Athlon FPU is really amazing, it sits idle most of the time. The low bandwidth results in a starved FPU. I've also heard some mumblings about the P4 not being able to get the most out of the cache bandwidth when not using SSE2, but I'm unsure of this point. -fyo