LIF - Low Insertion Force socket (no handle).
MD - Minimum Delay (modified timing).
µPGA - Micro Pin Grid Array.
MSPGA - Modified Staggered Pin Grid Array.
ODP - OverDrive Processor.
ODPR - OverDrive Processor Replacement.
PGA - Pin Grid Array.
SECC - Single Edge Contact Cartridge.
SEPP - Single Edge Processor Package (Celeron).
SPGA - Staggered Pin Grid Array.
Split - Split voltages (lower core with a 3.3v I/O).
STD - 3.3v (3.135v ~ 3.465v) - Standard Voltage.
VLIF - Very Low Insertion Force socket.
VR - 3.38v (3.300v ~ 3.465v) - Voltage Regulated.
VRE - 3.52v (3.450v ~ 3.600v) - (B-step) Voltage Regulated Extended.
VRE - 3.5v (3.400v ~ 3.600v) - (C2 step and later) Voltage Regulated Extended.
VRT - 2.9v_core / 3.3v_I/O - split Voltage Reduction Technology (mobile chips only).
VID VRM - Voltage ID Voltage Regulator Module (allows CPU to program VRM to proper voltage).
ZIF - Zero Insertion Force socket (with handle).

• Socket 7 and Socket 5 are very similar in appearance, but there are significant differences.
  • Socket 7 requires 5.0 amps at 3.3v, while Socket 5 only requires 4.33 amps.
  • The maximum power dissipation for Socket 7 is 17 watts, two watts higher than Socket 5.
  • Vertical clearance above the CPU was raised from 1.35" to 1.75".
  • Socket 7 comes with a 321^st pin located at AH-32 to be used for a KEY pin, which is not electronically connected to either the CPU or the motherboard.
  • Pin AL-01 is changed to Vcc2DET to identify split-rail voltages within newer processors.
  • Socket 7 is defined as a superset of Socket 5, and can handle all the previous processors that worked in Socket 5.
  • Also note that most all Socket 5 motherboards only support 1.5x and 2.0x multipliers, making their maximum processor speed 133MHz (66x2.0). And there are also some Socket 5 boards that can only go up to 120MHz.
• Earlier Socket 7 motherboards do not have split voltage capabilities required by MMX-capable chips (AMD K6, Cyrix 6x86MX, Intel Pentium MMX) as well as the Cyrix 6x86L processor.
• 233MHz (66x3.5) chips utilize the 1.5x multiplier as 3.5x on Socket 7 boards that do not have a jumper for 3.5x. Newer motherboards, on the other hand, will add a third jumper (BF2) to take care of higher clock multipliers.
• Newer chips that use a 4.0x multiplier or higher require a Socket 7 motherboard that has a third multiplier jumper. Unlike using the '1.5x' setting as '3.5x', setting a motherboard to '2.0x' won't produce a '4.0x' multiplier in the chip.
• The 62MHz and 68MHz bus speeds are 'turbo' modes for 60MHz and 66MHz speeds.
• As long as it isn't on-Die, the L2 cache on a Slot 1 processor runs at only half the core processor speed. Slot 2 has processors with full-speed L2 cache and larger size caches (1MB, 2MB).
• All bus speeds listed on this page are actual speeds; not DDR. The Slot A, Socket A, Socket 423/478, Socket 603, and PAC418 chips all use a dual (2x) or quad-pumped (4x) bus that hits on the rising and falling edges of the clock, yielding a faster effective bus speed. The quad-pumped bus works similar to that of AGP 4x mode (it uses a synchronous signal to double strobe each rising and falling edge).