Socket S1
Socket S1 is the CPU socket type used by AMD for their Turion 64, Athlon 64 Mobile, Phenom II Mobile and later Sempron processors, which debuted with the dual-core Turion 64 X2 CPUs on May 17, 2006. Technical specifications

Socket S1 is a 638 pin, low profile, ZIF, 1.27mm pitch socket. It replaces the existing Socket 754 in the mobile computing segment (e.g. laptops) as well as the microPGA Socket 563 form factor. Socket S1 CPUs can include support for dual-channel DDR2 SDRAM, dual-core mobile CPUs, and virtualization technology, and compete with the mobile Intel Core 2 processor series. Socket S1 revisions
Different generations of processors used various pinouts of the S1 socket; processors were not necessarily electrically-compatible with each socket even if they fit mechanically. Socket S1g1 or just S1
 Platforms: Kite and Kite Refresh
 CPUs: K8 core, HyperTransport 1.0, DDR2 memory
 Socket S1g2
 Platforms: Puma and Yukon
 CPUs: K8 Revision G core, HyperTransport 3.0, DDR2 memory
 Added:
 Split-power planes and linked power management support
 Support for possible low voltage processors
 Socket S1g3
 Platforms: Tigris 
 CPUs: K10.5 core, HyperTransport 3.0, DDR2 memory
 Socket S1g4
 Platforms: Danube
 CPUs: K10.5 core, HyperTransport 3.0, DDR3 memory

See also
 List of AMD microprocessors

References

External links
 AMD Preps to Switch to Socket S1, Socket M2, Socket F
 https://www.amd.com/system/files/TechDocs/31839.pdf (low profile socket S1 design specs)

AMD mobile sockets