Intel CPU Sockets

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Early Sockets (1990s)

Socket 1, 2, 3 (1990-1993)

  • Processors: Intel 80486 series (486).
  • Pins:
    • Socket 1: 169 pins.
    • Socket 2: 238 pins.
    • Socket 3: 237 pins (minor updates).

Socket 4 (1993)

  • Processors: Early Intel Pentium (60/66 MHz).
  • Pins: 273 pins.

Socket 5 (1994)

  • Processors: Pentium (75–133 MHz).
  • Pins: 320 pins.

Socket 7 (1995)

  • Processors: Pentium, AMD K5/K6, Cyrix 6×86.
  • Pins: 321 pins.
  • Feature: Open standard, used by multiple manufacturers.

Socket 8 (1996)

  • Processors: Pentium Pro.
  • Pins: 387 pins.

Slot Era (1997-1999)

Slot 1 (1997)

  • Processors: Pentium II, early Pentium III, and Celeron.
  • Type: Cartridge-based design for easier CPU upgrades.

Slot 2 (1998)

  • Processors: Pentium II Xeon and early Pentium III Xeon (server-grade).
  • Type: Larger slot for higher pin count and multi-CPU configurations.

Socket 370 (1999)

  • Processors: Pentium III, Celeron.
  • Pins: 370 pins.
  • Feature: Transition back to socketed designs from slots.

Pentium 4 and NetBurst Era (2000s)

Socket 423 (2000)

  • Processors: Early Pentium 4.
  • Pins: 423 pins.

Socket 478 (2001)

  • Processors: Pentium 4 (later models), Celeron.
  • Pins: 478 pins.
  • Feature: Replaced Socket 423 for better thermal management.

Modern Socket Revolution: LGA (Land Grid Array)

LGA 775 (Socket T) (2004)

  • Processors: Pentium 4, Pentium D, Core 2 Duo/Quad.
  • Pins: 775 pins.
  • Feature: First mainstream Intel socket to move contacts to the motherboard.

Core i Series (2006–2020)

LGA 1366 (Socket B) (2008)

  • Processors: Core i7 (Nehalem), Xeon.
  • Pins: 1366 pins.
  • Feature: Triple-channel DDR3 memory support.

LGA 1156 (Socket H1) (2009)

  • Processors: Core i3, i5, i7 (Lynnfield, Clarkdale).
  • Pins: 1156 pins.
  • Feature: Integrated memory controller and PCIe lanes.

LGA 1155 (Socket H2) (2011)

  • Processors: Sandy Bridge, Ivy Bridge.
  • Pins: 1155 pins.
  • Feature: Dual-channel DDR3.

LGA 2011 (Socket R) (2011)

  • Processors: High-end desktop (HEDT) and server processors.
  • Pins: 2011 pins.
  • Feature: Quad-channel DDR3/DDR4 memory support.

LGA 1150 (Socket H3) (2013)

  • Processors: Haswell, Broadwell.
  • Pins: 1150 pins.

LGA 1151 (2015)

  • Processors: Skylake, Kaby Lake, Coffee Lake.
  • Pins: 1151 pins.
  • Feature: Support for DDR3/DDR4 memory.

Recent and Current Generations (2020–2025)

LGA 1200 (2020)

  • Processors: 10th Gen (Comet Lake), 11th Gen (Rocket Lake).
  • Pins: 1200 pins.
  • Feature: DDR4, PCIe 3.0/4.0.

LGA 1700 (2021)

  • Processors: 12th Gen (Alder Lake), 13th Gen (Raptor Lake).
  • Pins: 1700 pins.
  • Feature: DDR4/DDR5 memory, PCIe 5.0, hybrid architecture (performance and efficiency cores).

LGA 4189 (Server)

  • Processors: Xeon Scalable (Ice Lake-SP).
  • Pins: 4189 pins.
  • Feature: Eight-channel DDR4, PCIe 4.0.

LGA 4677 (2023)

  • Processors: Xeon Scalable 4th Gen (Sapphire Rapids).
  • Pins: 4677 pins.
  • Feature: DDR5, PCIe 5.0, CXL (Compute Express Link).

Upcoming Socket

LGA 1851 (Expected 2024-2025)

  • Processors: 14th Gen Meteor Lake, Arrow Lake.
  • Feature: DDR5, energy efficiency, enhanced PCIe standards.