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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 198.12-5.2%3:59 PM EST
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To: jcholewa who wrote (20342)11/24/2000 1:42:12 PM
From: dale_laroyRead Replies (2) of 275872
 
I don't think Palimino will have SSE, but it might have hardware prefetch, and not the brain damaged hardware prefetch of P4.

I suspect that much of the explanation for both the great and poor results of P4 has to do with hardware prefetch. Bandwidth just isn't an important enough factor in Linpack to explain P4's stellar results. I think what we are seeing is that well behaved benchmarks, such as Linpack, Q3, and SPECfp are getting a large boost from hardware prefetch, while less well behaved benchmarks are taking an equal hit from the tendency of hardware prefetch to prematurely flush the cache.

AMD has patented a predictive cache architecture that associates prefetch with code execution patterns, presumably using bits in the branch history table. If AMD has improved the branch prediction of Palomino, they may very well have added the hardware necessary for predictive hardware prefetch.
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