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Socket 940
General Info
Designer	AMD
Introduction	April 22, 2003 (launched)
Market	Server
Microarchitecture	K8
TDP	110 W 110,000 mW 0.148 hp 0.11 kW
Package
Name	CPGA-940
Type	Ceramic Pin Grid Array
Contacts	940
Dimension	40.0 mm 4 cm 1.575 in × 40.0 mm 4 cm 1.575 in
Pitch	1.27 mm 0.05 in
Socket
Name	Socket 940
Type	PGA

Socket 940 was the socket for µCPGA-940 and µOPGA-940-packaged AMD Opteron and Athlon 64 FX microprocessors, AMD's first generation of server and workstation processors, based on the K8 microarchitecture. Socket 940 was superseded by Socket F.

The µOPGA-940 package for Socket 940 is mechanically (due to keying) and electrically incompatible with the 940-pin Socket AM2.

Features

• 940-pin lidded micro pin grid array, 1.27 mm pitch, 31 × 31 pins, 40 × 40 mm, ceramic or organic substrate
• 1.15 - 1.55 V supply voltage, 110 W TDP
• Three (desktop processors one) 16 bit HyperTransport interfaces
  • Up to 800 MHz, 1600 MT/s, 3.2 Gbyte/s in each direction
  • Up to 1000 MHz, 2000 MT/s, 4.0 Gbyte/s in each direction (Rev. E and later)
  • One coherent link on dual processor models 2xx
  • Three coherent links on multiprocessor models 8xx

• 128/144 bit DDR SDRAM interface up to 166 MHz, PC-2666 (DDR-333), 5.3 Gbyte/s
• 128/144 bit DDR SDRAM interface up to 200 MHz, PC-3200 (DDR-400), 6.4 Gbyte/s (Rev. C0 and later)
• Up to 8 RDIMMs, up to 4 Gbyte per DIMM, SEC-DED ECC
• Chip Kill ECC (server/workstation models)
• P-States, ACPI C1 (Halt), S1 (Stop Grant), S3 (Core & HT power down), S5 (all power off)
• Thermal diode, overtemperature protection

Chipsets

• AMD 8000 series
• Nvidia nForce3 Pro250, nForce Professional 2200

Processors using Socket 940

• Athlon 64 FX-51/53 codename "SledgeHammer"
• AMD Opteron 1xx/2xx/8xx "SledgeHammer" (130 nm; Rev. B3, C0, CG; CPGA-940)
• AMD Opteron 1xx/2xx/8xx "Venus", "Troy", "Athens" (90 nm; Rev. D4, E4; OPGA-940)
• AMD Opteron 1xx/2xx/8xx dual core "Denmark", "Italy", "Egypt" (90 nm; Rev. E1, E6; OPGA-940)

	List of all Socket 940-based Processors
Model	Price	Process	Launched	µarch	Family	Core	C	T	Freq	Turbo	TDP
Count: 0

Package Diagram

CPGA-940 package. All dimensions in millimeters.

Socket Outline

All dimensions in millimeters.

Pin Map

Notes:

• HT Link 1 and 2 are only available on server/workstation processors, NC on desktop processors.
• VLDT is referenced as a unified plane for desktop processors.
• Pin AK2 PRESENCE_DET is only used for server/workstation processors.

References

• "AMD Functional Data Sheet, 940 Pin Package", AMD Publ. #31412
• "AMD Socket 940 Design Specification", AMD Publ. # 25766
• "AMD Opteron™ Processor Product Data Sheet", AMD Publ. #23932
• "AMD Athlon™ 64 FX Product Data Sheet", AMD Publ. #30431
• Keltcher, Chetana N, et al. "The AMD Opteron Processor for Multiprocessor Servers", IEEE Micro 23(2):66–76, March 2003

See also

• Socket 754
• Socket 939
• Socket F