Article View: comp.arch
Article #12622Re: Is 64 bits enough address space?
From: headroom
Date: Mon, 09 Oct 1995 18:48
Date: Mon, 09 Oct 1995 18:48
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1665 bytes
In <458mrk$enl@inferno.mpx.com.au>, msmith@jolt.mpx.com.au (Michael Smith) writes: >Ian Watson (watson@cs.man.ac.uk) wrote: >It sounds as though everyone is agreeing with each other. We can't have >that in this news group. Allow me to supply an opposing point of view. > >There are two reasons for increasing your bus size. > 1. To address more memory > 2. To increase throughput (bandwidth). > >Very few people (who I know anyway) buy 64 bit machines to address more >than 4GB of memory. They do it to get faster throughput. The extra >address space is simply a side-effect. While increasing your bus from 32 >to 64 bits may increase your address space by an enormous amount, it only >increases the throughput by a factor of 2. I can easily imagine users >(in the next few years) wanting 128 bit graphics cards, disk controllers >and network interface cards and thus wanting a 128 bit bus. > >There! That should start an argument. No -- I don't think so -- you're confusing data and address bus widths. Address bus width has nothing to do with bandwidth to memory, and everything to do with how much of it you can have.
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Newsgroups: comp.arch,comp.lang.c Path: arc1-ca.pugleaf.net!passport.ca!news From: headroom@passport.ca Subject: Re: Is 64 bits enough address space? X-Nntp-Posting-Host: dial028.passport.ca Message-ID: <DG72w9.43@passport.ca> Sender: news@passport.ca Reply-To: headroom@passport.ca Organization: Passport Online, Toronto Canada X-Newsreader: IBM NewsReader/2 v1.2 References: <44sl81$hr1@murrow.corp.sgi.com> <44u6al$ml8@m1.cs.man.ac.uk> <458mrk$enl@inferno.mpx.com.au> Date: Mon, 9 Oct 1995 18:48:08 GMT