Author: Robert Hyatt
Date: 14:51:46 09/14/01
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On September 14, 2001 at 15:54:40, K. Burcham wrote: > > >below is part of an artical that i read on the net. >i know you could get real technical about 64 bit. not necessary >but here is my question. >if we have two processors both 1500 mhz. both same brand. but "a" > has 32 bit 1500 mhz with 32 bit program. >"b" has 64 bit 1500 mhz with 64 bit program. > >how would a kns benchtest compare with these two examples? >so if in example "a" the kns benchtest was 1200 kns for 32 bit, > what would the 64 bit do in a similiar benchtest. > > _if_ the 64 bit program really uses 64 bit integers, then it will be faster. Because the 64 bit processor is doing one 64 bit operation every cycle, while the 32 bit processor will do only one 32 bit operation every cycle. The requirement is that the program really has to use 64 bit stuff. But if it does, a 64 bit machine is potentially twice as fast as a 32 bit machine... That is the driving force behind 64 bit development, in fact. > >Hammer processors, sometimes referred to as "K8," will first be produced on an >advanced 0.13 micron SOI process out of AMD's Dresden megafab. Unlike Intel's >Itanium, Hammer chips will provide uncompromised performance on legacy 32-bit >applications as well as open up the 64-bit computing "new frontier." In fact, >Hammers are expected to be the fastest chips in the world at running 32-bit x86 >code, while seriously challenging the fastest 64-bit processors on 64-bit code. > It is unlikely they will do both well. But there are exceptions. IE if you use single-precision floats vs double-precision floats on an IBM RS6000, you will find _zero_ speed difference. Because the RS6000 does all FP operations in 64 bits. So using 32 bit numbers is somewhat slower than on a real 32 bit machine that pumps less data around. > > >The first desktop Hammer product, the so-called "Clawhammer," will also be only >slightly more expensive to produce than contemporary Athlons making 64-bit >processing a real option for the masses in the near future. > >kburcham
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