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Socket AM2 - AMD
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Socket AM2
General Info
IntroductionMay 23, 2006 (launched)
TDP125 W
NameOPGA-940 AM2
TypeOrganic Micro Pin Grid Array
Dimension40.0 mm × 40.0 mm
Pitch1.27 mm
NameSocket AM2

Socket AM2 was the socket for OPGA-940 and OPGA-938-packaged AMD microprocessors with an integrated DDR2 memory controller and the successor to Socket 939. Socket AM2 targets the performance, mainstream, and value desktop segment. Its contemporaries are Socket S1 for mobile processors and Socket F for the server and workstation market. For the small form factor desktop, mobile and embedded market AMD developed package ASB1. Socket AM2 was superseded by Socket AM2+.

The OPGA-940 package for Socket AM2 is compatible with Socket AM2+. The package has the same dimensions but is mechanically, due to keying, and electrically incompatible with Socket 939 for processors with a DDR memory controller, Socket 940 for first generation Opteron processors, and Socket AM3 and AM3+ for processors with a DDR3 memory controller.

Socket AM2+ processors in the OPGA-940 package and Socket AM3 processors in the OPGA-938 package are compatible with Socket AM2, subject to the motherboard recognizing the CPU and the limitations of Socket AM2.

All processors for Socket AM2 belong to AMD's NPT Family 0Fh and use the K8 microarchitecture.


  • 940-pin lidded micro pin grid array package, 1.27 mm pitch, 31 × 31 pins, 40 × 40 mm, organic substrate
  • 16 bit HyperTransport 1.0 interface up to 1 GHz, 2000 MT/s, 4 Gbyte/s in each direction
  • 128/144 bit DDR2 SDRAM interface up to 400 MHz, PC-6400 (DDR2-800), 12.8 Gbyte/s
    • Up to 4 UDIMMs (2 per channel), up to 4 Gbyte per UDIMM, SEC-DED ECC
    • JEDEC SSTL_1.8
  • P-States, ACPI C1, C1E (NPT Family 0Fh Rev. G and later processors), C2, S3, S5
  • Thermal diode, overtemperature protection


  • AMD 580, 690, 700 series
  • Nvidia nForce3, nForce4, nForce 400 series, nForce 500 series, nForce 630a, GeForce 8000 series
  • SiS 761GX, 771
  • VIA K8T890, K8M890, K8T900

Processors using Socket AM2[edit]

  • AMD Opteron codename "Santa Ana", "Budapest"
  • AMD Athlon 64 FX "Windsor"
  • AMD Athlon 64 X2 "Windsor", "Brisbane"
  • AMD Athlon "Orleans", "Lima"
  • AMD Sempron X2 "Brisbane"
  • AMD Sempron "Manila", "Sparta"
  • AMD Athlon Neo X2
 List of all Socket AM2-based Processors
Count: 0

Package Diagram[edit]

OPGA-940 AM2 diag.svg

OPGA-940 package for Socket AM2/AM2+. All dimensions in millimeters.

Socket Outline[edit]

Socket AM2 diag.svg

All dimensions in millimeters.

Pin Map[edit]

Socket AM2 pinmap.svg

Pin Description[edit]

Signal Description
CLKIN_H/L 200 MHz Differential PLL Reference Clock
CPU_PRESENT_L Processor is present
DBREQ_L, DBRDY Debug Request/Ready
HTREF0, HTREF1 HyperTransport Compensation Resistor to VSS, VLDT
L0_CADIN/OUT_H/L[15:0] HT Link 0 Differential Command/Address/Data Input/Output
L0_CLKIN/OUT_H/L[1:0] HT Link 0 Differential Clock Input/Output
L0_CTLIN_H/L[1:0] HT Link 0 Differential Control Input/Output
LDTSTOP_L HT Stop Control Input for power management and link width and frequency change
MA0/MA1/MB0/MB1_CLK_H/L[2:0] DRAM Differential Clock
MA0/MA1/MB0/MB1_CS_L[1:0] DRAM Chip Select
MA0/MA1/MB0/MB1_ODT[0] DRAM Enable Pin for On Die Termination
MA/MB_ADD[15:0] DRAM Column/Row Address
MA/MB_BANK[2:0] DRAM Bank Address
MA/MB_CAS_L DRAM Column Address Strobe
MA/MB_CKE[1:0] DRAM Clock Enable
MA/MB_DATA[63:0] DRAM Data Bus
MA/MB_DM[8:0] DRAM Data Mask
MA/MB_DQS_H/L[8:0] DRAM Differential Data Strobe
MA/MB_RAS_L DRAM Row Address Strobe
MA/MB_WE_L DRAM Write Enable
M_VREF DRAM Interface Voltage Reference
M_ZP, M_ZN Compensation Resistor to VSS, VDDIO
PROCHOT_L Processor in HTC-active state input/output
PSI_L Power Status Indicator (low power state) for VDD regulator
PWROK Voltages and CLKIN have reached specified operation
RESET_L Processor Reset
RSVD Reserved
SIC, SID Sideband (APML/SBI/SMBus) Temperature Sensor Interface Clock, Data
TEST* Test signal
THERMDA, THERMDC Thermal Diode Anode, Cathode
THERMTRIP_L Thermal Sensor Trip output
VDD Core power supply
VDD_FB_H/L Differential feedback to VDD regulator
VDDA Filtered PLL supply voltage
VDDIO DRAM I/O ring power supply
VDDIO_FB_H/L Differential feedback to VDDIO regulator
VID[5:0] Voltage ID for VDD regulator
VLDT_A/B HyperTransport I/O ring power supply
VSS Ground
VTT DRAM Termination voltage
VTT_SENSE VTT monitor pin


  • "Socket AM2 Design Specification", AMD Publ. #31875, Rev. 3.00, May 2008
  • "BIOS and Kernel Developer’s Guide for AMD NPT Family 0Fh Processors", AMD Publ. #32559, Rev. 3.16, November 2009
  • "AMD Opteron™ Processor Product Data Sheet", AMD Publ. #23932, Rev. 3.23, March 2007
  • "AMD Athlon™ 64 Processor Product Data Sheet", AMD Publ. #24659, Rev. 3.18, September 2006
  • "AMD Athlon™ 64 FX Product Data Sheet", AMD Publ. #30431, Rev. 3.16, September 2006
  • "AMD Sempron™ Processor Product Data Sheet", AMD Publ. #31805, Rev. 3.05, September 2006
  • "AMD Athlon™ 64 X2 Dual-Core Processor Product Data Sheet", AMD Publ. #33425, Rev. 3.10, January 2007
  • "Revision Guide for AMD NPT Family 0Fh Processors", AMD Publ. #33610, Rev. 3.48, December 2011

See also[edit]

Facts about "Socket AM2 - AMD"
designerAMD +
first launchedMay 23, 2006 +
instance ofpackage +
market segmentDesktop +
microarchitectureK8 +
nameSocket AM2 +
tdp125 W (125,000 mW, 0.168 hp, 0.125 kW) +