Microprocessor Upgrade

Posted on 1999-07-26
Medium Priority
Last Modified: 2012-05-04
I have recently decided to replace the 68LC040 processor in my Performa 638 with a full-function 68040, in order to have access to RealAudio, etc.  Nexus Communications offers used chips for just $39, but provides no chip extractor or instructions.  How hard is it to make this switch?  I've installed an MPEG card and RAM myself, will I be able to manage this?  Will buying a used microprocessor be asking for trouble?
Question by:rgannon
  • 2

Author Comment

ID: 1539310
Adjusted points to 385

Expert Comment

ID: 1539311
If changing this chip involves soldering, I would suggest that yes, you are asking for trouble. Surface mount soldering is tricky business, and I would suggest that you take the parts to your local electronics shop. They would have the proper equipment and know-how to complete this task without incurring any permanent damage to your MBoard.

Author Comment

ID: 1539312
I don't know whether or not changing the microprocessor in a Performa 638 requires soldering.  That's one of the things I would expect an "expert" to know.  Also, the proposed answer does not address the issue of whether or not buying a used processor chip is a good idea.

Accepted Solution

wilkofj earned 1770 total points
ID: 1539313
To find out if the upgrade would require soldering, take the case off the computer and find the processor.  It will be the one with a heat sink on it.  Heat sinks come in hundreds if not thousands of different shapes and styles.  A sure fire way to know which on it is is after you've been using the computer a while turn it off and remove the case.  The heat sink will be the hottest thing on the board.  Don't worry, it won't burn you.  Once you have found the processor, you have to answer one question... Is the processor soldered to the mother board, or is it on a card that is in a slot on a mother board?  I just checked Apple Spec and found that the processor in your Mac is soldered directly on the motherboard.  Because of this I STRONGLY advise AGAINST attempting to remove it and solder another on the board, because the computer stores information about the processor in an inaccessible area and if you change the processor you're computer won't know what to do at startup and you'll permanently damage the computer.  
  On the subject of buying a used processor, first of all I've never heard of anyone selling USED processors, so I would question the credibility of the source.  Some companies such as Newer Technology sell processor upgrade cards.  I have one of NT's cards in my machine and it works great.  I looked around and I couldn't find any processor upgrade cards for your computer.  

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