The Intel 450 Mhz chips were all PII's. You can run PC133 at 100 Mhz. As a general rule the problems you are describing sound like software problems. Does your mobo support a PIII 750?  If it was old enough to have an original 450, it is possible the mobo does not support the current setup.


 upgraded my wife's computer recently from a P3-450 to a P3-700.
>
>I don't use this computer, so I can't attest that the following
>symptoms happened after the upgrade, but here's what she's seen:
>
>1. Her Handspring Visor no longer syncs. (I have verified that USB
>devices do work, however.)
>
>2. Burned audio CDs produced _very_ poor music quality. Lots of static
>and hiss.
>
>3. Her CD-RW backup software intermittently fails.
>
>My general question: Can upgrading a processor cause these things?
>
>The processor I bought is a P3/700Mhz/100Mhz. It is the OEM variety,
>which means that it had the holes and stumps necessary on which to
>hook the original processor's heat sink and fan.
>
>The RAM is PC133, which has never been an issue while running the
>450mhz. Truth be told, I don't know whether the 450 was a 100mhz FSB
>kind, but I've not been able to find a 133mhz 450mhz p3. Perhaps there
>isn't one.
>
>Thoughts anyone?
>
>Cheers,
>
>Mike Whalen
>
>         PCBUILD maintains hundreds of useful files for download
>                     visit our download web page at:
>                  http://freepctech.com/downloads.shtml
>
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