Socket M

Socket M. It is a microprocessor socket introduced by Intel Corporation in early 2006 as a mobile computing platform component. The interface was designed for the company's Yonah microarchitecture processors and later supported certain Merom-based mobile chips. Socket M represented a transitional phase in Intel's mobile processor strategy before the widespread adoption of its Core microarchitecture.

Technical specifications

Socket M features a 478-pin PGA-ZIF design, maintaining the same pin count as its predecessor, Socket 479, but with a different electrical and physical pinout to prevent incorrect installation. It officially supports a front-side bus speed of either 533 MT/s or 667 MT/s, providing a direct connection to the Intel 945 Express chipset family. The socket's design facilitated improved power management features critical for mobile platforms, aligning with Intel's Centrino platform specifications of the era. Key supporting technologies included Enhanced Intel SpeedStep Technology and deeper C-states for better battery life in laptop computers.

Supported processors

The primary processors for Socket M were based on the 65-nanometer Yonah core, including the Intel Core Solo, Intel Core Duo, and Intel Celeron M product lines. Notably, a limited number of mobile Intel Core 2 Duo processors, specifically those using the Merom core but packaged for the Socket M interface, were also officially supported. This compatibility provided a minor upgrade path for some systems before the transition to Socket P. These CPUs were integral to Intel's Napa platform refresh of the Centrino brand, competing against contemporary mobile offerings from Advanced Micro Devices.

Motherboard compatibility

Motherboards utilizing Socket M were predominantly found in mid-2000s mobile computers and utilized the Intel 945PM and Intel 945GM chipsets. These platforms, part of the Intel 945 Express series, provided support for DDR2 SDRAM and PCI Express graphics, often paired with integrated graphics from the Intel GMA 950. System manufacturers like Dell, Hewlett-Packard, Lenovo, Toshiba, and Acer produced numerous laptop models based on this socket and chipset combination. Compatibility was strictly defined by the chipset and BIOS support, with only specific motherboard revisions able to accept the later Merom-based Intel Core 2 Duo processors.

Successor and market position

Socket M was quickly succeeded in 2007 by Socket P, which was designed for the Santa Rosa platform and the newer Penryn processors. The introduction of Socket 441 for Intel Atom processors also filled a different, lower-power market segment. Socket M's market position was that of a short-lived but important transitional socket, bridging the final Intel Pentium M-derived designs and the new Core microarchitecture. Its existence coincided with a period of intense competition with Advanced Micro Devices in the mobile space, particularly against their Turion 64 and later Turion 64 X2 mobile processors.

Physical design and pinout

Physically, Socket M measures 35mm x 35mm and uses a PGA (Pin Grid Array) layout with a zero insertion force lever. Despite sharing an identical pin count with Socket 479, the pinout arrangement was altered, making the sockets mechanically incompatible to prevent end-user confusion and potential hardware damage. The socket's pinout defined connections for the processor core voltage, FSB signals, and various power and ground planes essential for stable operation. This design was finalized by Intel's engineering teams to meet the thermal and spatial constraints of contemporary laptop form factors while supporting dual-core processor configurations.

Category:CPU sockets Category:Intel microprocessors Category:Computer hardware introduced in 2006