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Socket G34 - AMD
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Socket G34
General Info
IntroductionMarch 29, 2010 (launched)
MicroarchitectureK10, Bulldozer, Piledriver
TDP140 W
Dimension60.0 mm × 42.5 mm
Pitch1.00 mm
NameSocket G34

Socket G34 was designed for LGA-1944-packaged AMD Opteron 6000 Series microprocessors optimized for performance per Watt and scalability. The designation G34 stands for AMD's third generation server socket with four memory channels. Socket G34 has a DDR3 memory interface while its predecessors Socket 940 and Socket F were designed for DDR and DDR2 memory, respectively, and also offers additional HyperTransport links to improve the bandwidth and latency between nodes on multiprocessor systems. It has a smaller sibling Socket C32 which supports two memory channels and three HT links as the prior generations. Uniprocessor Opterons with a DDR3 interface were released in packages for Socket AM3 and AM3+ which make a single HT link available. Socket G34 was superseded by Socket SP3.

The LGA-1944 package is a multi-chip module integrating two dies, each providing four 16-bit HyperTransport Gen 3 links and two DDR3 memory controllers. Each HT link can be further unganged into two independent 8-bit links. The package has 1132 signal I/O, 341 power, and 471 ground pins. Package size constrained the HT interface to 64 lanes total, one x16 and one x8 link from node 0, two x16 links and one x8 link from node 1. One x16 link on node 0 is not connected, the remaining links connect the nodes in the package. Each link can be used for I/O, e.g. connecting a GPU through a HT-PCI bridge, or for cache coherent inter-socket traffic using an AMD proprietary protocol, with flexible routing permitting various network topologies on 2P and 4P systems. 8P systems were not considered due to insufficient demand.

G34 Opteron MP topologies.svg

Socket G34 was used in AMD's 2- and 4-socket "Maranello" reference platform. The processors for this socket are members of AMD's Family 10h with up to 12 CPU cores based on the K10 microarchitecture, and Family 15h featuring up to 8 compute units (not exactly 16 cores) based on the Bulldozer and Piledriver microarchitectures. They were fabricated on 45 nm and 32 nm processes.

Supposedly AMD originally planned a 1305-pin "Socket G3" for 1P to 8P systems with two DDR3 memory channels per socket. To reach higher memory capacities AMD proposed a "G3 Memory Extender" (G3MX) chip mounted on the motherboard to buffer the signals of four RDIMMs on two channels, and up to two G3MXs connected to each CPU memory channel.


  • Lidded land grid array package, 60.0 mm × 42.5 mm
    • 1944 contacts in a 57 × 40 grid with 1.0 mm pitch
    • Organic substrate, C4 flip chip die attachment
  • 4 × 64/72 bit DDR3 SDRAM interface up to 933 MHz, PC3-14900 (DDR3-1866), 29.87 GB/s total raw bandwidth
    • Up to 12 SR/DR/4R RDIMMs, 12 SR/DR LRDIMMs (Fam. 15h), or 8 SR/DR UDIMMs
    • JEDEC 1.5V, 1.35V, 1.25V (Fam. 15h)
    • ECC supported
    • AMD Memory Controller PowerCap (Fam. 15h)
    • On-line spare feature provides single-rank DRAM redundancy
  • 3 × 16 + 2 × 8 bit HyperTransport 1.0/3.0 interface up to 3200 MHz, 6400 MT/s, 12.8 GB/s in each direction
    • HT Assist Technology (probe filter)
    • Link Speed PowerCap (Fam. 15h)
    • Link Width PowerCap (Fam. 15h)
  • Managemement Features
    • Advanced Platform Management Link (APML)
    • SMBus v2.0-compatible interface
    • Remote-Management Interface (SB-RMI)
  • Power Management
    • Multiple low-power states
    • Independent Dynamic Core Technology (Fam. 10h)
    • AMD CoolCore Technology (Fam. 10h)
    • Dual Dynamic Power Management (Fam. 10h)
    • Advanced Power Management (Fam. 15h)
    • AMD Turbo CORE technology with per core power gating (Fam. 15h)
    • CPU PowerCap (Fam. 15h)
    • Effective frequency interface (Fam. 15h)
    • ACPI-compliant
      • Supported power states Fam. 10h: C0, C1, C1E, S0, S1, S3, S4, S5
      • Supported power states Fam. 15h: C0, C1, C1E, C6, CC6, S0, S3, S4, S5
    • Hardware thermal control


  • AMD SR5690, SR5670, SR5650
  • AMD SP5100 southbridge

Processors using Socket G34[edit]

 List of all Socket G34-based Processors
Count: 0


Package Diagram[edit]

LGA-1944 diag.svg

LGA-1944 package. All dimensions in millimeters.

Socket Diagram[edit]

Socket G34 TEC diag.svg

Dimensions of TE Connectivity LGA Socket 1944 (G34), Part No. 2069189. All dimensions in millimeters.

Socket G34 TEC PCB layout.svg

PCB layout of TE Connectivity Socket G34. All dimensions in millimeters.

Pin Map[edit]

Socket G34 pinmap.svg

Socket G34 pinout, top view. This is a preview, click for a larger image and other views.

Pin Description[edit]

Signal Description
MA/MB/MC/MD_ADD[15:0] DRAM Channel A-D Column/Row Address
MA/MB/MC/MD_BANK[2:0] DRAM Bank Address
MA/MB/MC/MD_CAS_L DRAM Column Address Strobe
MA/MB/MC/MD_CKE[1:0] DRAM Clock Enable
MA/MB/MC/MD_CLK_H/L[4:0] DRAM Differential Clock
MA/MB/MC/MD_DATA[63:0] DRAM Data Bus
MA/MB/MC/MD_DQS_H/L[17:0] DRAM Differential Data Strobe
MA/MB/MC/MD_EVENT_L DRAM Thermal Event Status
MA/MB/MC/MD_RAS_L DRAM Row Address Strobe
MA/MB/MC/MD_WE_L DRAM Write Enable
DRAM Chip Select
DRAM Enable Pin for On Die Termination
M_VREF[1:0] DRAM Interface Voltage Reference
L0/L1/L2/L3_CADIN_H/L[15:0] HT Link 0-3 Differential Command/Address/Data Input
L0/L1/L2/L3_CADOUT_H/L[15:0] HT Link 0-3 Differential Command/Address/Data Output
L0/L1/L2/L3_CLKIN_H/L[1:0] HT Link 0-3 Differential Clock Input
L0/L1/L2/L3_CLKOUT_H/L[1:0] HT Link 0-3 Differential Clock Output
L0/L1/L2/L3_CTLIN_H/L[1:0] HT Link 0-3 Differential Control Input
L0/L1/L2/L3_CTLOUT_H/L[1:0] HT Link 0-3 Differential Control Output
LDTSTOP_L HT Stop Control Input for power management and link width and frequency change
HTREF0, ? HT Compensation Resistor to VSS, VLDT
CLKIN_H/L Differential PLL Reference Clock
PWROK Voltages and CLKIN have reached specified operation
RESET_L Processor Reset
PROCHOT_L Processor in HTC-active state
SIC Sideband Interface Clock[1]
SID Sideband Interface Data
THERMTRIP_L Temperature Trip
DBREQ_L Debug Request input to JTAG controller
TDI JTAG Data Input
TDO JTAG Data Output
TMS JTAG Mode Select
TEST* Test Pins
SVC Serial VID Interface Clock
SVD Serial VID Interface Data
VDD Core power supply
VDD_SENSE VDD voltage monitor pin
VDDIO DRAM I/O ring power supply
VDDIO_FB_H/L Differential feedback to VDDIO regulator
VDDNB Northbridge power supply
VDDNB_SENSE VDDNB voltage monitor pin
VDDR VDDR power supply
VDDR_SENSE VDDR voltage monitor pin
VLDT HyperTransport I/O ring power supply
VLDT_SENSE VLDT voltage monitor pin
VSS Ground
VSS_SENSE VSS sense output for voltage regulators
SA[2:0] Socket Identifier
CPU_PRESENT_L CPU Presence Indicator
RSVD Reserved
  1. The Sideband Interface (SBI) a.k.a. APML is a SMBus interconnect to the processor's SB-RMI and SB-TSI interfaces.


See also[edit]

Facts about "Socket G34 - AMD"
designerAMD +
first launchedMarch 29, 2010 +
instance ofpackage +
market segmentServer +
microarchitectureK10 +, Bulldozer + and Piledriver +
nameSocket G34 +
tdp140 W (140,000 mW, 0.188 hp, 0.14 kW) +