: Primary slot for high-performance graphics cards.

Note: The SFF board uses a proprietary Dell heatsink and fan shroud. Do not lose the air duct.

| Label | Type | Description | |-------|------|-------------| | PSWD | 2-pin jumper | Clear BIOS password (short while powered off) | | RTCRST | 2-pin jumper | Clear CMOS / RTC memory | | F_PANEL | 20-pin header | Power switch, HDD LED, power LED, speaker (non‑standard) | | SATA0-3 | 7-pin SATA | SATA 3Gb/s ports for drives | | F_USB1/F_USB2 | 9-pin | Front USB 2.0 headers | | F_AUDIO | 10-pin | Front panel mic/headphone (AC’97 or HDA) | | SER_PORT | 10-pin | Serial port header (optional) |

Replacement PSUs must be Dell-specific (e.g., from an Optiplex 740, 745, or 755) unless you rewire the connector.

A picture is worth a thousand words, but a pinout is worth a thousand repairs. Below are the essential pin diagrams for your Optiplex 740 motherboard.

Five rear ports (eight total including front and internal). Ethernet: RJ-45 Broadcom 5754 Gigabit LAN.

Diagram Best: Dell Optiplex 740 Motherboard

: Primary slot for high-performance graphics cards.

Note: The SFF board uses a proprietary Dell heatsink and fan shroud. Do not lose the air duct. Dell Optiplex 740 Motherboard Diagram

Replacement PSUs must be Dell-specific (e.g., from an Optiplex 740, 745, or 755) unless you rewire the connector. Five rear ports (eight total including front and internal)

A picture is worth a thousand words, but a pinout is worth a thousand repairs. Below are the essential pin diagrams for your Optiplex 740 motherboard.

Five rear ports (eight total including front and internal). Ethernet: RJ-45 Broadcom 5754 Gigabit LAN.