CPU Socket Types

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CPU packaging refers to the CPU’s form factor and how it is connected to the motherboard.

• Intel and AMD use different socket types
  • cannot install an AMD CPU in a motherboard designed for an Intel CPU (and vice versa)
• All CPU sockets use a zero insertion force (ZIF) mechanism
  • no pressure is required to insert the CPU, reducing the risk of bending or breaking the fragile pin contacts
• Intel uses land grid array (LGA) socket form factor CPUs
  • LGA form factor positions the pins that connect the CPU on the socket
  • CPU is placed on a hinged plate and then secured to the socket using a locking lever
• AMD uses pin grid array (PGA) form factor chips predominantly
  • PGA form factor positions the pins on the underside of the processor package
  • CPU is placed gently into the socket and then secured using a locking lever
  • Care must be taken to orient pin 1 on the CPU correctly with pin 1 on the socket so as not to bend or break any of the pins
• When removing a CPU with a heat sink and fan assembly:
  • use a gentle twist to remove the heat sink to avoid it sticking to the CPU
  • Release the latch securing the CPU before attempting to remove it
• If reinstalling the same heat sink
  • clean old thermal grease from the surfaces and apply a small amount of new grease in an X pattern
  • Do not apply too much—if it overruns, the excess could damage the socket