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BX Chipset with a PII 266

Posted on 1998-07-08
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I have a new Asus P2B PII motherboard with the BX chipset, for now I would like to stick my PII 266 processor on the board, the vendor selling me the board is telling me i need to upgrade my Sdram to PC100. My gut feeling said this wasn't right, the FSB for a PII 266 is going to be set to 66 so the same Sdram I have on my LX board should work fine. Curious i called another Vendor that I deal with and their tech told me that although PC100 Sdram would work it would not be as stable as my old ram in this configuration... so my question is: which one is right (10pts) and why(50 pts)?
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Question by:ewilson
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jhance earned 240 total points
ID: 1137074
There is NO problem using your existing 66MHz SDRAM in the BX chipset board as long as you run the FSB (that's front side bus) at 66MHz.  The BX chipset, however, has the capability of running the FSB at 100MHz when used with a 350, 400, or 450MHz Pentium II CPU.  Your PII 266 (while it might work at 100MHz FSB) was designed to work with a 66MHz bus and any higher frequency will be out of spec.  I don't know why these techs you talked to both gave you incorrect information.  The facts are that existing 66MHz SDRAM will work fine in a BX chipset MB at 66MHz.
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by:ewilson
ID: 1137075
Thnank you have answered my question, but i believe you misunderstood one thing. I was NEVER intending to set my FSB to 100 mhz.  Part of the Question is will PC100 Sdram function properly if it is running on a 66 mhz bus.  the reason i am curios is  the vendor is offering to let me trade in my 66 ram for 100 so it will only cost me $20 to upgrade my 64 megs.
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by:jhance
ID: 1137076
I was just try to be complete in my answer.  There is no problem running a 100MHz SDRAM at 66MHz.  If you are looking to try overclocking your 266MHz CPU, this would likely increase the probability of it working as well.  
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by:ewilson
ID: 1137077
Thanks
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