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). 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 variant pinouts of the S1 socket; processors were not necessarily compatible with a 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