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Find the socket of your CPU

Necessary if you're thinking about replacing it (see replace CPU).

The best way to proceed is to find your CPU model and to compare it to the socket list at the bottom of this page or by making a quick search on Google with the model. You can also look at the socket itself under the CPU to compare it with pictures online, impossible to confound.

A few Intel sockets

Socket 370 - Celeron, Pentium III
Socket 423 - Pentium 4
Socket 478 - Intel Celeron, Pentium 4
Socket 603 - Xeon
Socket 604 - Xeon
Socket 771 - Xeon
Socket LGA775 - Core 2 Duo, Core 2 Quad
Socket LGA1156 - Core i3, Core i5, Core i7

A few AMD sockets

Socket 754 - AMD Athlon 64, Turion 64 et Sempron
Socket 939 - AMD Athlon 64, Athlon 64 X2
Socket 940 - AMD Athlon 64, Opteron
Socket AM2 - AMD Athlon 64
Socket AM3 - AMD Phenom II, Opteron
Socket AM3+ - AMD FX