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Author Topic: 100Mhz Crystal needed for my Apollo 1240  (Read 1205 times)

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Offline AmigaNut08Topic starter

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100Mhz Crystal needed for my Apollo 1240
« on: May 20, 2009, 10:42:27 PM »
Hi,
 about 11 or so years ago not long after i purchased my Apollo 1240 040@25Mhz (No. On CPU reads XC68040RC25M) i was told it can be overclocked with out any problems after reading the numbers on the CPU to someone i knew that worked on Amiga's back then. I have since been running it at 40Mhz without fail. I did have to put a slightly larger fan on it though. At the same time i was offered a 100Mhz crystal to try on the Apollo but i thought i'd stick with 40Mhz. I mm now eager to try my 040@50Mhz. Does anyone have a 100Mhz Crystal for sale, or know were i can buy a 100Mhz crystal that will fit my Apollo board.

Cheers
« Last Edit: May 21, 2009, 12:12:14 AM by AmigaNut08 »
 

Offline Crisisdog

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Re: 100Mhz Crystal needed for my Apollo 1240
« Reply #1 on: May 20, 2009, 11:07:55 PM »
Quote from: AmigaNut08;455379
Hi,
Now knowing (well i have known for a while, just my interest in getting my 040 to run faster is recent) that the old Macs use to have 040's running at 66Mhz i am eager to try my 040@50Mhz.

Cheers


I'm not aware of any Macs running at a "true" 66Mhz with a 68040.  Marketing promoted the fact that the internal speed was clock-doubled (much like a 486DX2) at 66MHz, but that would in reality be a 33MHz chip.

However, Sonnet at one point offered a 040 plug-in board overclocked at 50MHz, but it had a peltier cooler glued to the top.
 

Offline AmigaNut08Topic starter

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Re: 100Mhz Crystal needed for my Apollo 1240
« Reply #2 on: May 21, 2009, 12:14:53 AM »
Quote from: Crisisdog;455382
I'm not aware of any Macs running at a "true" 66Mhz with a 68040.  Marketing promoted the fact that the internal speed was clock-doubled (much like a 486DX2) at 66MHz, but that would in reality be a 33MHz chip.

However, Sonnet at one point offered a 040 plug-in board overclocked at 50MHz, but it had a peltier cooler glued to the top.


Yes you are right and i have adjusted my original post as the information was not correct. I was going by what someone told me and a quick search on everymac has a power PC @66Mhz not an 040 as i was told.

 I will still like to try my 040@50Mhz though.

Cheers