D2156-S21 GS3

Fujitsu Siemens D2156-S21 GS3 Industrial ATX Motherboard

The Fujitsu Siemens D2156-S21 GS3 is a long-life industrial ATX motherboard based on the Intel 945G chipset and designed for Intel LGA775 processor platforms. The board combines DDR2 memory support, integrated graphics, Gigabit Ethernet, SATA II storage and both PCI Express and conventional PCI expansion for industrial and embedded computing applications.

The GS3 designation identifies the specific board revision and should be retained when sourcing a replacement for existing industrial equipment. The D2156-S21 platform was designed for professional and industrial systems where long-term availability, legacy PCI support and hardware compatibility are important.

Key Features

• Manufacturer: Fujitsu Siemens Computers
• Model: D2156-S21
• Board Revision: GS3
• Product Type: Industrial Motherboard / System Board
• Form Factor: ATX
• Processor Socket: LGA775
• Chipset: Intel 945G
• Processor Platform: Compatible Intel LGA775 processors
• Memory: DDR2 SDRAM
• Memory Slots: 4 x DIMM
• Maximum Memory: Up to 4 GB
• Memory Architecture: Dual Channel
• Graphics: Integrated Intel GMA950
• Video Output: VGA
• Ethernet Controller: Broadcom BCM5751
• Network Interface: 10/100/1000 Mbps Gigabit Ethernet
• Storage: 4 x Serial ATA II 300 interfaces
• Legacy Storage: ATA100 IDE interface
• RAID Support: RAID 0, 1, 0+1 and 5
• Audio: High Definition Audio
• Expansion: PCI Express and conventional PCI
• USB: USB 2.0
• Designed for industrial, embedded and professional computing systems

Processor and Memory Platform

The D2156-S21 GS3 uses the Intel 945G platform with an LGA775 processor socket. Four DDR2 DIMM sockets provide up to 4 GB of system memory with dual-channel operation. Processor compatibility should be verified against the installed BIOS and the requirements of the original equipment when replacing a board in an existing industrial system.

Expansion and Storage

The D2156-S21 GS3 provides both PCI Express and conventional PCI expansion, allowing the motherboard to support specialized legacy PCI cards while also providing PCI Express connectivity. Storage interfaces include four SATA II 300 connections together with an ATA100 IDE interface for legacy storage devices.

Industrial and Legacy Applications

The Fujitsu Siemens D2156-S21 GS3 is suitable for industrial automation, manufacturing equipment, machine-control systems, process-control equipment, test and measurement platforms, industrial workstations and other long-life systems requiring an Intel 945G/LGA775 ATX motherboard.

GS3 Replacement Considerations

When replacing a D2156-S21 GS3, the complete model and GS revision should be verified against the original motherboard. BIOS revision, processor configuration, memory, expansion cards and OEM system requirements can affect compatibility. For equipment originally qualified with GS3, sourcing the same D2156-S21 GS3 revision provides the closest replacement configuration.

Replacement, Repair and Availability

Embedded CPU Boards supports the Fujitsu Siemens D2156-S21 GS3 for sourcing, replacement, repair and legacy-system support. Availability may include new-old-stock, surplus, refurbished or professionally tested units depending on current inventory.

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