Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!uwmcsd1!leah!itsgw!steinmetz!caesar!perley
From: perley@caesar.steinmetz (Donald P Perley)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Is 14.32MHz too fast for my expansion RAM?
Message-ID: <11988@steinmetz.ge.com>
Date: 26 Aug 88 12:44:11 GMT
References: <3127@sdsu.UUCP> <4572@cbmvax.UUCP>
Sender: news@steinmetz.ge.com
Reply-To: perley@caesar.steinmetz.ge.com (Donald P Perley)
Distribution: comp.sys.amiga.tech
Organization: General Electric CRD, Schenectady, NY
Lines: 30

In article <4572@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
>in article <3127@sdsu.UUCP>, larryr@sdsu.UUCP (Larry Riedel) says:

>> I am thinking about getting that 14MHz 68000 thing from CMI, but I am
>> wondering if the extra clock speed will be wasted. 

>All of the Amiga speedup boards run the Expansion Bus memory at it's
>normal speed.  They do speed the system up, but they only run faster
>in the following cases:
>
>	- Internal CPU operation
>	- Cache hit
>	- Access to special fast memory
>
>.  A plain fast
>68000 with no on-board memory designed specifically for it will only
>get the first benefit.


I don't know about the CMI board, but some 68000 speedup boards have
floating point processor sockets.  If you use it, and are running 
programs with a lot of FP computation that support it, you should
get a dramatic speed increase, yes/no? 

If you do a lot of floating point stuff (and a lot of graphics programs do),
it sounds like a lot more bang for the buck compared to a 68020 board
with coprocessor at ~$1000 more (plus 32 bit memory to get a real advantage
over the 68000).

-don perley