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Socket AM3 - AMD
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Socket AM3
General Info
DesignerAMD
IntroductionFebruary 9, 2009 (launched)
MarketDesktop
MicroarchitectureK10
TDP125 W
Package
NameOPGA-938
TypeOrganic Micro Pin Grid Array
Contacts938
Dimension40.0 mm × 40.0 mm
Pitch1.27 mm
Socket
NameSocket AM3
TypePGA

Socket AM3 was the socket for OPGA-938 and OPGA-940-packaged AMD microprocessors with an integrated DDR2/DDR3 memory controller and the successor to Socket AM2+. Socket AM3 targets the desktop segment. Its contemporaries are Socket S1 for mobile processors, Socket C32 and Socket G34 for the server and workstation market. For the small form factor desktop, mobile and embedded market AMD developed package ASB2. Socket AM3 was superseded by Socket AM3+.

Socket AM3 processors use the OPGA-938 package and, supporting both DDR2 and DDR3 SDRAM, are compatible with the earlier Sockets AM2 and AM2+, subject to the motherboard recognizing the CPU and configuring its memory controller for DDR2 mode. These processors are likewise compatible with Socket AM3+. Socket AM3 and AM3+ motherboards use DDR3 SDRAM and configure the processor accordingly. The OPGA-938 package has the same dimensions but is mechanically, due to keying, and electrically incompatible with Socket 939 for processors with a DDR memory controller, and Socket 940 for first generation Opteron processors.

Socket AM3+ processors use the OPGA-940 package and are compatible with Socket AM3, subject to the motherboard recognizing the CPU and the limitations of Socket AM3. The OPGA-940 package for Socket AM2/AM2+ differs from the OPGA-940 package for Socket AM3/AM3+ by keying and electrically. The former carries CPUs requiring DDR2 SDRAM, the latter processors supporting DDR3 SDRAM exclusively. Socket AM2/AM2+ processors are therefore incompatible with Socket AM3.

All processors for Socket AM3 belong to AMD's Family 10h and use the K10 microarchitecture.

Features[edit]

  • 938/940-pin lidded micro pin grid array package, 1.27 mm pitch, 31 × 31 pins, 40 × 40 mm, organic substrate
  • 16 bit HyperTransport interface
    • Generation 1.0 mode up to 1 GHz, 2000 MT/s, 4 Gbyte/s in each direction
    • Generation 3.0 mode up to 2.2 GHz, 4400 MT/s, 8.8 Gbyte/s in each direction
  • 2 × 64/72 bit DDR2 SDRAM interface (ganged or unganged) up to 533 MHz, PC-8500 (DDR2-1066), 17.0 Gbyte/s
    • Up to 4 UDIMMs (2 per channel), up to 4 Gbyte per UDIMM, SEC-DED ECC
    • JEDEC SSTL_1.8
  • 2 × 64/72 bit DDR3 SDRAM interface (ganged or unganged) up to 667 MHz, PC3-10600 (DDR3-1333), 21.3 Gbyte/s
    • Up to 4 UDIMMs (2 per channel), up to 8 Gbyte per UDIMM, SEC-DED ECC
    • JEDEC 1.5V
  • Mixing of DDR2 and DDR3 or ECC and non-ECC DIMMs is not supported
  • P-States; ACPI C0, C1, C1E, S0, S1, S3, S4, S5; dual power planes
  • Thermal diode, overtemperature protection

Chipsets[edit]

  • AMD 700, 800, 900 series
  • Nvidia nForce 630a, 980a SLI

Processors using Socket AM3[edit]

  • AMD Opteron "Suzuka" (4C UP)
  • AMD Phenom II X6 "Thuban", X4 "Zosma", X4 (native) "Deneb", X3 "Heka", X2 "Callisto"
  • AMD Phenom II XLT
  • AMD Athlon II X4 "Propus", X3 "Rana", X2 "Regor"
  • AMD Athlon II "Sargas"
  • AMD Athlon II XL and XLT
  • AMD Sempron X2 "Regor"
  • AMD Sempron "Sargas"
 List of all Socket AM3-based Processors
ModelPriceProcessLaunchedµarchFamilyCoreCTFreqTurboTDP
Count: 0

Package Diagram[edit]

OPGA-938 diag.svg

OPGA-938 package. All dimensions in millimeters.

OPGA-940 AM3 diag.svg

OPGA-940 package for Socket AM3/AM3+. All dimensions in millimeters.

Socket Outline[edit]

Socket AM3 diag.svg

Socket AM3. Note the socket cover has 941 pin holes. Pin B2 is not populated on the OPGA-938 and OPGA-940 package and unconnected on the socket. All dimensions in millimeters.

Pin Map[edit]

Socket AM3 pinmap.svg

Socket AM2/AM2+/AM3 Differences[edit]

Pin Socket AM2 Socket AM2+ Socket AM3
AL4 RSVD ALERT_L ALERT_L
G5 RSVD CORE_TYPE CORE_TYPE
G20 MA1_CLK_H[1] MA1_CLK_H[1] MA_CLK_H[0]
G21 MA1_CLK_L[1] MA1_CLK_L[1] MA_CLK_L[0]
G19 MA0_CLK_H[1] MA0_CLK_H[1] MA_CLK_H[1]
H19 MA0_CLK_L[1] MA0_CLK_L[1] MA_CLK_L[1]
U24 RSVD RSVD MA_CLK_H[2]
V24 RSVD RSVD MA_CLK_L[2]
W26 RSVD RSVD MA_CLK_H[3]
W25 RSVD RSVD MA_CLK_L[3]
V27 MA1_CLK_H[0] MA1_CLK_H[0] MA_CLK_H[4]
W27 MA1_CLK_L[0] MA1_CLK_L[0] MA_CLK_L[4]
U27 MA0_CLK_H[0] MA0_CLK_H[0] MA_CLK_H[5]
U26 MA0_CLK_L[0] MA0_CLK_L[0] MA_CLK_L[5]
AE20 MA1_CLK_H[2] MA1_CLK_H[2] MA_CLK_H[6]
AE19 MA1_CLK_L[2] MA1_CLK_L[2] MA_CLK_L[6]
AG21 MA0_CLK_H[2] MA0_CLK_H[2] MA_CLK_H[7]
AG20 MA0_CLK_L[2] MA0_CLK_L[2] MA_CLK_L[7]
C19 MB1_CLK_H[1] MB1_CLK_H[1] MB_CLK_H[0]
D19 MB1_CLK_L[1] MB1_CLK_L[1] MB_CLK_L[0]
A18 MB0_CLK_H[1] MB0_CLK_H[1] MB_CLK_H[1]
A19 MB0_CLK_L[1] MB0_CLK_L[1] MB_CLK_L[1]
V31 RSVD RSVD MB_CLK_H[2]
W31 RSVD RSVD MB_CLK_L[2]
Y31 RSVD RSVD MB_CLK_H[3]
Y30 RSVD RSVD MB_CLK_L[3]
W29 MB1_CLK_H[0] MB1_CLK_H[0] MB_CLK_H[4]
W28 MB1_CLK_L[0] MB1_CLK_L[0] MB_CLK_L[4]
U31 MB0_CLK_H[0] MB0_CLK_H[0] MB_CLK_H[5]
U30 MB0_CLK_L[0] MB0_CLK_L[0] MB_CLK_L[5]
AL19 MB1_CLK_H[2] MB1_CLK_H[2] MB_CLK_H[6]
AL18 MB1_CLK_L[2] MB1_CLK_L[2] MB_CLK_L[6]
AJ19 MB0_CLK_H[2] MB0_CLK_H[2] MB_CLK_H[7]
AK19 MB0_CLK_L[2] MB0_CLK_L[2] MB_CLK_L[7]
W30 RSVD RSVD MA_EVENT_L
V29 RSVD RSVD MB_EVENT_L
AE28 RSVD RSVD MA0_ODT[1]
AE27 RSVD RSVD MA1_ODT[1]
AF31 RSVD RSVD MB0_ODT[1]
AG31 RSVD RSVD MB1_ODT[1]
E20 RSVD RSVD MA_RESET_L
B19 RSVD RSVD MB_RESET_L
F3 RSVD RSVD M_VDDIO_PWRGD
F2 RSVD PLATFORM_TYPE
AK4 RSVD SA[0] SA[0]
E2 VID[1] PVIEN/VID[1] PVIEN/VID[1]
E3 VID[2] SVD/VID[2] SVD/VID[2]
C1 VID[3] SVC/VID[3] SVC/VID[3]
A4 VDD VDDNB VDDNB
A6 VDD VDDNB VDDNB
B5 VDD VDDNB VDDNB
B7 VDD VDDNB VDDNB
C6 VDD VDDNB VDDNB
C8 VDD VDDNB VDDNB
D7 VDD VDDNB VDDNB
D9 VDD VDDNB VDDNB
E10 VDD VDDNB VDDNB
E8 VDD VDDNB VDDNB
F11 VDD VDDNB VDDNB
F9 VDD VDDNB VDDNB
G10 VDD VDDNB VDDNB
G12 VDD VDDNB VDDNB
G4 RSVD VDDNB_FB_H VDDNB_FB_H
G3 RSVD VDDNB_FB_L VDDNB_FB_L
A12 VTT VTT VDDR
AG12 VTT VTT VDDR
AH12 VTT VTT VDDR
AJ12 VTT VTT VDDR
AK12 VTT VTT VDDR
AL12 VTT VTT VDDR
B12 VTT VTT VDDR
C12 VTT VTT VDDR
D12 VTT VTT VDDR
E12 VTT_SENSE VTT_SENSE VDDR_SENSE
B2 VOID VOID NP/RSVD
AE7 VOID VOID NP/VSS
H20 VOID VOID NP/VSS
AE9 VSS VSS VOID
H22 VSS VSS VOID

Pin Description[edit]

Signal Description
ALERT_L Programmable pin that can indicate different events, including a SB-TSI interrupt
CLKIN_H/L 200 MHz Differential PLL Reference Clock
CORE_TYPE Indicates that the processor is capable of split core and northbridge voltage plane operation
CPU_PRESENT_L Processor is present, shorted to VSS on the package
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
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_CHECK[7:0] DRAM ECC Bits
MA/MB_CKE[1:0] DRAM Clock Enable
MA/MB_CLK_H/L[7:0] DRAM Differential Clock
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_EVENT_L DRAM Thermal Event Status
MA/MB_RAS_L DRAM Row Address Strobe
MA/MB_RESET_L DRAM Reset Pin for Suspend-to-RAM Power Management Mode
MA/MB_WE_L DRAM Write Enable
MA0/MA1/MB0/MB1_CS_L[1:0] DRAM Chip Select
MA0/MA1/MB0/MB1_ODT[1:0] DRAM Enable Pin for On Die Termination
M_VDDIO_PWRGD Not supported
M_VREF DRAM Interface Voltage Reference
M_ZP, M_ZN Compensation Resistor to VSS, VDDIO
NP/RSVD Pin is not populated on OPGA-938 and OPGA-940 package, unconnected on Socket AM3
NP/VSS Pin is not populated on OPGA-938 package, connected to ground on OPGA-940 and Socket AM3
PROCHOT_L Processor in HTC-active state input/output
PSI_L Power Status Indicator (low power state) for VDD regulator
PVIEN/VID[1] Prior to PWROK assertion signals to the processor whether the platform supports PVI or SVI operation
PWROK Voltages and CLKIN have reached specified operation
RESET_L Processor Reset
RSVD Reserved
SA[0] Sideband interface (APML/SBI/SMBus) address selection
SIC, SID Sideband Temperature Sensor Interface Clock/Data
SVC/VID[3] Serial VID Interface Clock
SVD/VID[2] Serial VID Interface Data
TCK, TDI, TDO, TMS, TRST_L JTAG interface
TEST* Test signal
THERMDA, THERMDC Thermal Diode Anode, Cathode
THERMTRIP_L Thermal Sensor Trip output
VDDA Filtered PLL supply voltage
VDDIO DRAM I/O ring power supply
VDDIO_FB_H/L Differential feedback to VDDIO regulator
VDDNB Northbridge power supply
VDDNB_FB_H/L Differential feedback to VDDNB regulator
VDDR VDDR power supply
VDDR_SENSE VDDR voltage monitor pin
VDD Core power supply
VDD_FB_H/L Differential feedback to VDD regulator
VID[5:0] Voltage ID (PVI) for VDD regulator
VLDT_A/B HyperTransport I/O ring power supply
VOID Missing pins and pin holes for mechanical keying
VSS Ground

References[edit]

  • "Socket AM3 Design Specification", AMD Publ. #40523, Rev. 1.06, April 2010
  • "Socket AM3 Processor Functional Data Sheet", AMD Publ. #40778, Rev. 1.13, January 2009
  • "BIOS and Kernel Developer’s Guide (BKDG) for AMD Family 10h Processors", AMD Publ. #31116, Rev. 3.48, April 22, 2010
  • "Family 10h AMD Opteron™ Processor Product Data Sheet", AMD Publ. #40036, Rev. 3.04, June 2010
  • "Family 10h AMD Phenom™ II Processor Product Data Sheet", AMD Publ. #46878, Rev. 3.04, February 2009
  • "Family 10h AMD Athlon™ II Processor Product Data Sheet", AMD Publ. #49457, Rev. 3.05, February 2011
  • "Revision Guide for AMD Family 10h Processors", AMD Publ. #41322, Rev. 3.92, March 2012

See also[edit]

Facts about "Socket AM3 - AMD"
designerAMD +
first launchedFebruary 9, 2009 +
instance ofpackage +
market segmentDesktop +
microarchitectureK10 +
nameSocket AM3 +
tdp125 W (125,000 mW, 0.168 hp, 0.125 kW) +