This is a general guidline in helping you when choosing CPU manufacture, the CPU series and as a result give you the coresponding CPU socket requirements for the Motherboard you will need to build or upgrade you computer rig.

AMD CPU Series
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AM2 CPU socket:
AMD Athon 64 X2 Dual Core.

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AM2+ CPU socket:

AMD CPU Triple Core Series:
AMD Phenom 8450 Toliman 2.1Ghz
AMD Phenom 8600B 2.3Ghz
AMD Phenom 8750 Toliman 2.4Ghz
 
AMD CPU Quad Core Series:
AMD Phenom 9750B 2.4Ggz ?
AMD Phenom 9950 2.6GHz
AMD Phenom X4 9150e 1.8Ghz
AMD Phenom II X4 920 2.8Ghz
AMD Phenom II X4 940 Deneb Black Edition 3.0Ghz.
AMD Phenom II X4 955 3.2 Black Edition Deneb 3.2Ghz
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AM3 socket:

AMD CPU Triple Core Series:
Amd Phenom II X3 720 Black Edition 2.8Ghz
 
AMD CPU Quad Core Series:
AMD Phenom 9600 Agena 2.3Ghz
AMD Phenom II X4 945 Deneb 3.0Ghz
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Intel Cpu Series:

Both Core 2 Duo (Dual core processores) and Core 2 Quad (Quad core processores) use the LGA 775 socket.

All core i7 quad core series use the LGA 1366 socket.