They are used on laptops just not anymore. On older laptops Pentium 4 and AMD FX processors where not used not because of size, because they could not develop a cost safe cooling system (a fan that spins fast enough) to keep the processors cool enough during peak performace. They started to use these when the technoligy was developed (out there) and fairly praced but was hardly used because core duo came out soon after and was expected to come even sooner therefor they stoped working with the single processors and starting using the cooling tech for duo but theres still alot with outhere with those processors just no longer manufactured.
"M" stands for Mobile, usually Pentium M processors are used in Laptops (like mine). Please see link for additional detail.
Intel Pentium processor
Slot 1 motherboards were primarily designed for the Pentium II and early Pentium III processors. A Pentium Pro could be used with a special converter known as a "slotket." Later Pentium III processors could be retrofitted to work on Slot 1 boards with a similar slotket.
There are several "main" differences, that are important, depending on what context you are interested in them for. PowerPC processors are primarily manufactured by IBM and Freescale. Pentium processors are manufactured by Intel. PowerPC processors can operate in both little-endian and big-endian modes. Pentium processors (and compatibles) are little-endian only. PowerPC processors are used in some servers, game consoles, and in embedded kiosks. They were also used in Macs before 2005. Pentium (and compatible) processors are used in most desktop computers, the original Xbox, servers, and some embedded kiosks.
Pentium II Processors were slot-based, and did not use a socket like most processors did. Imagine a game boy cartrige-- The Pentium II had a connection band just like a game cartrige does.Socket (Slot) Types used by PII:Slot 1MMC-1MMC-2Mini-Cartridge
Contemporary computers mostly use either Intel or AMD processors. The Pentium brand of Intel processors is the most popular in the world.
A Pentium D in a computer is used to handle intensive games and multi tasking. It is powered by two core processors that offers exceptional functionality.
I'm not sure what the pinout is, but you cannot use a laptop processor in a desktop application. Most laptop processors are designed to consume less voltage and produce less heat than there desktop cousins. Only very high-end laptops use desktop processors in them, such as www.alienware.com
There were a few laptops that used Pentium 4s. However, Pentium 4s generated too much heat and drew too much power for them to be practical.
Socket 370 was used by the last of the Pentium IIIs, their corresponding low-end equivalent Celerons, and certain VIA processors.
Modern processors and computer components use silicone. Older processors such as the 80486 and Pentium used ceramic on the original chips, and switched to silicone.
The Intel Pentium M is a type of processor that is used in laptops. The M stands for mobile and the Pentium M is designed to use less power and generate less heat than a processor used in a desktop.