Intel's 90nm Pentium M 755: Dothan Investigatedby Anand Lal Shimpi on July 21, 2004 12:05 AM EST
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The Pentium M SocketThere's a bit of confusion regarding the Pentium M's compatibility with desktop Pentium 4 motherboards. Remember that although the Pentium M is electrically compatibile with the Pentium 4's FSB, it is not pin compatible with the Pentium 4.
The Pentium M CPU has the same number of pins as a Pentium 4. However, the pinout is completely different, meaning that what's actually carried on those 478 pins is not the same between the two chips.
Intel went one step further and changed the location of the keying pins to make sure that you could not physically install a Pentium M CPU into a Pentium 4 motherboard.
The Pentium M on the right is keyed differently than the Pentium 4 on the left. Thus, you can't put a Pentium M into a Pentium 4 socket, mobile or desktop.
That being said, there's nothing stopping a motherboard manufacturer from producing a desktop motherboard that supports the Pentium M processor - because once again, the Pentium M is electrically compatible with the Pentium 4 and should thus work with any desktop Pentium 4 chipset.