Pentium 4s were available in Socket 423, Socket 478, and LGA 775.
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 7
Socket 8
Will a Socket 478 Pentium 4 fit in an LGA775 socket?No. The pinout is totally different. Technically, LGA775 is not even a socket. The LGA775 actually has the pins sticking UP, and the processor is flat.Will an LGA775 Pentium 4 work in an LGA775 socket?Yes. However, support for Pentium 4s was discontinued in the P35 and later chipsets.Are there adapters to fit a Socket 478 Pentium 4 into an LGA775 socket?Yes. These are expensive, though, making it much more worthwhile to purchase an LGA775 P4 in the first place.
3.0 GHz Pentium 4s were manufactured for both Socket 478 and LGA775.
Pentium 4 sockets were sockets numbers Socket 423 for early Pentium 4's. Then socket 478 for Pentium 4, Pentium 4 Extreme Edition and Celeron and socket T (LGA 775) for Pentium 4, Pentium D dual core, Celeron D and Pentium Extreme Edition.
Pentium Pro
No. The Intel Pentium 4 line was produced for three sockets. The shortlived Socket 423, Socket 478, and LGA 775 (sometimes called Socket T).
No. The Pentium II was only available in a Slot 1 cartridge, with the exception of the Pentium II Overdrive, which was made as an upgrade to Socket 8 motherboards. Pentium II-based Celerons, however, were the first processors available for Socket 370, which was later used for Pentium IIIs.
Socket A.
Socket 423
All Pentium 4s are single-core, so I'm not sure where you're getting "2 CPU" from. This may come from later Pentium 4s' use of HyperThreading, which is presented to the operating system as two processors, though only consisting of one.