Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!elroy!gryphon!richard
From: richard@gryphon.CTS.COM (Richard Sexton)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Is 14.32MHz too fast for my expansion RAM?
Summary: Think of it as a math chip
Keywords: vegemite
Message-ID: <5926@gryphon.CTS.COM>
Date: 26 Aug 88 07:36:12 GMT
References: <3127@sdsu.UUCP> <4553@cbmvax.UUCP>
Reply-To: richard@gryphon.CTS.COM (Richard Sexton)
Distribution: comp.sys.amiga.tech
Organization: Trailing Edge Technology, Redondo Beach, CA
Lines: 34

In article <4553@cbmvax.UUCP> grr@cbmvax.UUCP (George Robbins) writes:
>In article <3127@sdsu.UUCP> larryr@sdsu.UCSD.EDU (Larry Riedel) writes:
>> 
>> I am thinking about getting that 14MHz 68000 thing from CMI, but I am
>> wondering if the extra clock speed will be wasted.  I have one of those
>> Micron 2MB boards, and I don't know how fast the memory is.  Will the
>> fast processor just be hurry-up-and-waiting?
>
>Unless you have some local high-speed memory, most likely on the speed-up
>board, the extra clock speed will be mostly, but not quite completely
>wasted...  Of course, some people get excited about a 5-10% speed up,
>so cases do differ.  8-)

Yes. 

Anything the processor does completely internally will happen at
14 Mhz. As soon as it has to go to 8 Mhz vanilla memory the whole
thing comes to a grinding wait (state).

As far as I can see, the only real gain is in the area of math operations.
I seem to recall that this is the board with the socket for a 68881. This
is a big gain for floating point.

A 68000 running at 14 Mhz still does math instructions at a full 14Mhz
(one you get the operands INTO the 68000), and given that a 68010 does
a multiply in 2/3 the cycles of a 68000, this board may be a gain to 
somebody doing a lot of math, assuming you can get a 14 Mhz 68010.

Translation: it wont make your compiles go faster, but if you do a lot
of number crunching it's probably well worth the money.


-- 
       How can you believe anything labeled: <8086@cup.portal.com> ?
richard@gryphon.CTS.COM                               {backbone}!gryphon!richard