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1994-07-29
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Path: cdrom.com!barrnet.net!agate!msuinfo!harbinger.cc.monash.edu.au!news.uwa.edu.au!multi.multiline.com.au!not-for-mail
From: mdutton@cougar.multiline.com.au (Mark Dutton)
Newsgroups: alt.games.doom
Subject: Re: Does a 486DX run Doom faster than an SX?
Date: 29 Jul 1994 20:51:24 +0800
Organization: 1990 Multiline BBS
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References: <30sgts$mut@vixen.cso.uiuc.edu> <collise.940724074906@spitfire.eng.auburn.edu> <30ts9e$89v@poplar.cs.scarolina.edu> <rick.671.00352E88@onramp.net> <3114gb$e2c@eis.wfunet.wfu.edu>
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Dave Ahn (ahn@wfu.edu) wrote:
: Doom is currently the informal "benchmark" and "compatibility" testers
: for a lot of PC vendors right now (go see SIGGRAPH or any EXPO). Why?
: Because Doom pushes the capabilities of a 486 box as a whole. Every
: relevant component must be well designed and fitted together with every
: other component in order for Doom to work well. If you have a Pentium 90
: CPU with a cheap $50 VLB video card and 4MB of 80ns RAM, you're not going
: to see any better performance than a 486-25SX with a top-of-the line
: 32/64 bit VLB accelerator board and 16MB of 60ns RAM. Because the crappy
: components in the Pentium 90 box cause a bottle neck.
: So, given two identical systems, a faster CPU will normally result in
: better Doom performance so long as the other components (in particular
: the memory, bus speed, video and HD/controller). This is not always
: true, though. If you compare two identical systems with a DX2-66 and
: a DX-50, the DX-50 might be faster. Why? because the CPU can communicate
: faster with other components because of the faster bus speed. (Go
: read the comp.sys.ibm.pc.hardware.* FAQ if you don't know the difference
: between DX's and DX2's and DX4's)
: I have an SX-25, Diamond Stealth 32 VLB 2MB, a good MB, 8MB of 60ns RAM
: and a cached SCSI ISA controller. It performs better than a friend's
: not so well equipped DX-40 (AMD), and almost as well as a 486DX2-50 with
: ATI Mach32 VLB, 8MB 70ns RAM and VLB IDE. No choppiness at full
: screen except when you have a _lot_ of monsters/actions (Nightmare!)
It makes no difference whether your memory is 80ns or 60ns if the computer
will work with either. The speed of the RAM is not determined by the number
stamped on the package. That is determined by the clock speed (and number of
wait states) used by the mother board to access the RAM. If you computer
will work with 80ns RAM it will work the same with 60ns RAM. A good analogy
is this. If you buy a set of 80 watt speakers, they are designed to handle
80watts of audio power. They are not automatically louder than 60 watt
speakers.
Besides, this is a Doom thread, why are we talking about the inner workings
of PC hardware? :-)
MD