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CPU Pin21 on Pentium II

Posted on 1998-06-10
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Last Modified: 2010-04-26
According to Tom's hardware guide (tomshardware.com/Celeronto100.html) you can get all 66 MHz Slot 1 CPU's to run at 100 MHz on a BX board by simply covering the B21 pin on the P-II's connectors.
I've heard that Intel changed this, and ships the newer P-II's with a safeguard against taping off the B21 pin. Can anyone tell me if this is true? Are the newer P-II's "fixed" to keep overclockers from hiding the B21 pin??
 
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Question by:reetkever
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by:reetkever
ID: 1136023
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by:reetkever
ID: 1136024
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by:reetkever
ID: 1136025
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jhance earned 300 total points
ID: 1136026
First, not ALL PII will work at 100MHz.  If you read what "Tom" says, you'll see that some will and some won't.  

It is true that some of the PII chips are now being shipped by Intel with the connection from pin 21 on the conector to the CPU removed.  This will keep you from "casually" trying to cover pin21 and overclock.  A determined user can still do it, however, as all you have to do is remove the plastic case and connect the pin to the CPU with a jumper.  Of course, it help to be handy with a soldering iron.  At this point, it's not exactly clear which PIIs are "neutered" by Intel and which are not so it may take some trial-and-error and/or visual inspection to verify what you have.  As more data becomes available, it may be possible to determine by date code or rev level.
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Expert Comment

by:larbel
ID: 1136027
Save yourseft the trouble...  Buy an Asus or Abit board which will let you manually run any PII at up to 133 FSB.
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Author Comment

by:reetkever
ID: 1136028
I'd like to thank jou for your answer, there's one more thing: You mentioned that on close inspection I could determine whether the B21 is "neutered" or not. Can I verify this without opening the cover (that is *before* I decide to buy) or does the cover has to be opened?
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Expert Comment

by:jhance
ID: 1136029
If you have a good DMM (digital multi-meter) you could determine if the pin is open or not.  Measure the resistance from pin21 to both the +VCC supply and to GROUND.  If you get infinite (or > 1MEG Ohm) then it's likely disconnected.  If it < 10K to either, then it's probably connected.

BTW, the plastic case just snaps off after you release the little plastic catches around the edge.
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Author Comment

by:reetkever
ID: 1136030
I think I'm going to follow up on larbel's advice which will save me the hassle. Thanks larbel.
I want to thank jhance for sharing his knowledge.(where do you get all this information??)
Take care.

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