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Nov 7 9:30 AM EST

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To: fp_scientist who wrote (132630)	4/21/2001 1:10:25 PM
From: fyodor_	Read Replies (2) of 186894

fp: The Pentium 4 is a great chip for intensive FP scientific applications. I am afraid that these are not representative of the PC "mainstream." Being an "fp scientist" myself, I can say that's NOT true. The P4 has decent fp performance coupled with awesome bandwidth performance, resulting in decent total performance if your dataset is small, great total performance if your dataset is large. In the case of the former, a much better choice would be an Athlon. The P4 (and PIII, from which its fp unit draws heavily) is also a bit sensitive when it comes to square roots and 1/x operations. If you have a lot of these in your fp code, an Athlon performs much better. For the work I'm currently doing, I use relatively large datasets, but a rather unfortunate mix of instructions making the code perform quite poorly on the P4 (regardless of optimization - all the inner loops are hand optimized in assembly). -fyo

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