The Inspiron 4150 (actually a rebadged Latitude C640, which I am familiar with) is a P4 machine that takes a Socket 478 CPU, and from what I've been reading on the Dell forums (such as this thread
), the machine can take any SL6-series P4-M chip. As far as I can tell, the newer/faster SL7 series, badged as the "Mobile Pentium 4" instead of P4-M, won't work despite having the same CPU connector.
Wikipedia has a section
in its list of P4 processors that should work with the machine. Your best bet to get such a CPU is probably eBay.
Dell's website has documentation
on how to tear down the machine, so that you can remove the mainboard and replace the CPU.
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