CPU for differnt sockets

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There are a myraid of cpu sockets, which are all mutually incompatible, so it is important when you buy parts to suit what you need.

This guide would not discuss the relative merit of each cpu, just the basic physical characteristic of the CPU/socket involved, only the more recent CPUs are mentioned.

Sockets are usually catagorized by the number of pins of the CPU that it is designed for, thus different CPU cannot be inserted in sockets not designed for it (not without some elbow grease and determination anyway)

Socket 423 - Intel Pentium 4
Socket 462 / Socket A - Athlon, Athlon XP, Duron, Athlon XP-M, Athlon MP, Sempron
Socket 478 - Intel Pentium 4, Celeron, Pentium 4 Extreme Edition
Socket 479 - Intel Pentium M, Celeron M
Socket 563 - AMD Athlon XP-M
Socket 603 - Intel Xeon
Socket 604 - Intel Xeon
Socket 754 - AMD Athlon 64, Sempron, Turion 64
Socket 771 - Intel Xeon
Socket 775 / Socket T / LGA 775 - Intel Pentium 4, Pentium D, Celeron D, Pentium Extreme Edition, Core 2 Duo, Core 2 Extreme
Socket 939 - AMD Athlon 64, Athlon 64 FX, Athlon 64 X2, Opteron 100-series
Socket 940 - AMD 64 FX, AMD Opteron
Socket AM2 - AMD Athlon 64, Athlon 64 X2

for some older motherboard the socket might be able to accept the CPU, but the chipset of the motherboard might not be compatible, or a BIOS update is necessary for the CPU, its recommended to check the manufacturer's page for more detailed information.

When purchasing CPUs it is important to note what type of socket they use, because various CPUs have different version that cater to different sockets. For example in the Intel CPUS there are three versions of the basic Pentium 4, Willamette which have two version each for the socket 423 and 478, Northwood which uses socket 478 exclusively, and Prescott which have two version for socet 478 and socket 775 / LGA 775. Similarly for the AMD CPUs the Athlon 64 ClawHammer, Newcastle and Venice have two different version for socket 754 and socket 939 and Winchester, Manchesterand San Diego uses the socket 939 exclusively, and Orleans uses the socket AM2 format.
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