Dell E93839 Ga0402 Motherboard Specs Upd _top_ 【2025】

The Dell E93839 GA0402 is a proprietary motherboard commonly found in the Dell OptiPlex 780 series. It is designed for business-class reliability and features the LGA 775 socket (Socket T), making it compatible with older Intel dual-core and quad-core processors. Core Specifications Form Factor: MicroATX (Proprietary). Chipset: Intel Q45 Express with ICH10DO. CPU Socket: LGA 775. Memory Support: Type: DDR3 SDRAM (Non-ECC only).

Maximum Capacity: Up to 8 GB or 16 GB (configuration dependent). Slots: 4 DIMM slots. Speed: Up to 1066 MHz. Expansion Slots: 1 x PCI Express x16. 2 x PCI Express x1. Connectivity & Ports

Video Output: Integrated Intel graphics with VGA and DisplayPort outputs.

USB Ports: Up to 10 USB 2.0 ports (typically 6 rear, 4 internal/front). dell e93839 ga0402 motherboard specs upd

Storage: 4 x SATA II (3.0 Gb/s) connectors and 1 x eSATA port.

Networking: Integrated Intel 82567LM or Broadcom Gigabit Ethernet.

Legacy Support: Includes Serial (RS-232) and Parallel (IEEE 1284) ports. Upgrade Insights The Dell E93839 GA0402 is a proprietary motherboard

CPU Upgrades: Supports Intel Core 2 Quad, Core 2 Duo, Pentium Dual-Core, and Celeron processors with a Front Side Bus (FSB) up to 1333 MHz.

GPU Upgrades: While it has a PCIe x16 slot, its compatibility with modern GPUs is limited by the system's proprietary power supply and physical chassis size (Mini-Tower vs. Small Form Factor).

OS Support: While originally shipped with Windows XP/7, these boards can typically run modern 64-bit operating systems to fully utilize more than 4GB of RAM. Dell OptiPlex DDR3 Memory Compatibility Guide Issue 1: Random Reboots with 4 RAM Slots Populated

Note: The "GA0402" is a Dell internal part number variant. This board is primarily known as the Dell 0D28YY (or similar revisions like 0C2KJT) in the OptiPlex 790/990 series. The E93839 is the PCB model number.

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Issue 1: Random Reboots with 4 RAM Slots Populated

• Fix: Underclock RAM to 667 MHz in BIOS. This board has weak memory voltage regulation.

7. Physical and Power Specifications

• Form Factor: Dell Proprietary ATX (approx 9.6" x 9.6" Micro-ATX dimensions, but mounting holes are specific to the OptiPlex chassis).
• Power Connector: 24-pin ATX Main Power + 4-pin ATX 12V CPU Power.
• Front Panel Connector: Proprietary block header for Power Switch, Power LED, and HDD LED (standard Dell front panel pinout).

Troubleshooting Tips

• No POST: Reseat RAM, check CPU power connector, clear CMOS via jumper or battery removal.
• No video: Try integrated video (remove GPU), reseat GPU, test known-good monitor/cable.
• Memory errors: Test with single DIMM in recommended slot; run memtest86.

How to Verify Exact Specs (recommended steps)

1. Find the Dell Service Tag / Express Service Code on the system label.
2. Visit Dell Support and enter the service tag to get exact motherboard model, manuals, and drivers.
3. If service tag isn’t available: open case and read silkscreen on motherboard for complete part number (e.g., GA0402-xxx) and check CPU socket/chipset markings.
4. Use hardware tools (CPU-Z, HWiNFO) to report chipset, memory type, and BIOS information if system boots.

BIOS / Firmware Updates

• Latest BIOS version (as of last Dell release): A25 / A26 (depending on revision)
• Update method: Dell Flash Utility (DOS/Windows) or Dell Command | Update
• What updates improve:
  • Security patches (Spectre/Meltdown microcode)
  • RAM compatibility
  • SSD/NVMe boot support (via PCIe adapter card – not natively)
  • Fan control curves and USB wake behavior

3. Memory (RAM)

• Type: DDR3, Non-ECC, Unbuffered
• Slots: 4 x DIMM (240-pin)
• Max Capacity: 16GB (4 x 4GB) – some sources claim 32GB with 8GB modules (rarely tested).
• Speed: 1066 MHz or 1333 MHz (limited by CPU). 1600 MHz modules will downclock.
• Dual Channel: Yes (matched pairs in slots 1&3 or 2&4).

Helpful Review: Is it Worth Buying?

If you are looking to repair an OptiPlex 7040 or build a compact office rig, here is the practical "real world" review of this board.

11. Typical Problems & Fixes

| Problem | Solution | |---------|----------| | No POST after CPU upgrade | Clear CMOS (jumper or battery removal). Update to BIOS A12 first. | | Front panel wiring confusion | Use Dell OptiPlex 790 pinout diagram (Power SW: pins 4 & 6 on header). | | Fan runs at 100% | Wrong fan header – use CPU_FAN for CPU cooler; SYS_FAN for case fan. | | GPU not recognized | Disable Secure Boot; force Legacy ROM in BIOS. |