Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!sun!amdcad!brahms!phil
From: phil@brahms.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Speed of RAM
Keywords: speed, RAM
Message-ID: <1991Apr16.163258.24221@amd.com>
Date: 16 Apr 91 16:32:58 GMT
References: <1991Apr15.134754.7239@swsrv1.cirr.com> <1991Apr15.233221.18417@amd.com> <2fkgv6n@rpi.edu>
Sender: usenet@amd.com (NNTP Posting)
Organization: Advanced Micro Devices, Inc.
Lines: 29

dorsai@iear.arts.rpi.edu (gregory d moncreaff) writes:
>please. all the guy seemed to want to know was what the general relation 
>between processor chip clock speed (MHz) and the access time (ns) required

Unfortunately, there is no general relationship. It depends on:

	the processor (286 is different from 386 is different from 486)
	the motherboard (some motherboards automatically put in a wait state),
	whether there is cache
	whether the memory is interleaved
	whether it is paged
	the chipset
	how the chipset is configured
	how much memory you have
	how big your memory chips are
	what kind of memory chips you have (1megx1 or 256Kx4)
	And a whole bunch of other things.

Just because you want a simple answer doesn't mean there is one.

>getting theoretical, on the other hand, my memory controller, in a 386sx-16Mhz
>board, the 82c212, says that it will support 0 wait states with 120ns ram. as
>the motherboard was sent to me with 80ns rams on it i am slightly confused.
>perhaps Mr Ngai can enligten us?

You prove my point.

--
	The best way to preserve your RKBA is to vote Libertarian.