The board has specific headers for the front I/O panel that are often misdiagnosed.
2 x PCIe Gen3 x16 (Slots 2 & 5) – Primary graphics card slots. 1 x PCIe Gen3 x8 (Slot 4 - open-ended). 1 x PCIe Gen2 x4 (Slot 3 - open-ended). 1 x PCIe Gen2 x1 (Slot 1 - open-ended). 1 x Legacy PCI slot (Slot 6). Connectivity and Headers
While this article provides the textual diagram, you should download the official . Look for Figure 2-5, "System board components" and Figure 2-6, "System board jumpers." Hp Z440 Motherboard Diagram
This replaces the standard 24-pin. It provides 12V, 5V, 3.3V, and control signals.
The is a single-socket workstation based on the Intel C612 chipset (Haswell-EP/Broadwell-EP). Unlike proprietary consumer boards, its unique power delivery, memory routing, and dedicated PCIe layout are critical for diagnostics, upgrades, and repairs. Below is a descriptive diagram breakdown. The board has specific headers for the front
The HP Z440 motherboard is a marvel of engineering hamstrung by proprietary connectors. By memorizing the physical layout—specifically the location of the 18-pin power header (bottom right), the front panel 10-pin header (J27), and the PCIe lane allocation (x16/x8/x4/x8)—you can repair, upgrade, and optimize this workstation to outperform many modern budget PCs.
| Pin | Signal | Function | Standard ATX Equivalent | | :--- | :--- | :--- | :--- | | 1 | +12V | Main 12V rail | 12V (Yellow) | | 2 | +12V | Main 12V rail | 12V (Yellow) | | 3 | GND | Ground | Black | | 4 | GND | Ground | Black | | 5 | +5VSB | Standby voltage | Purple | | 6 | GND | Ground | Black | | 7 | +5V | Logic voltage | Red | | 8 | +5V | Logic voltage | Red | | 9 | GND | Ground | Black | | 10 | PS_ON# | Power supply turn-on (Green) | Green | | 11 | +3.3V | Modern drives/PCIe | Orange | | 12 | +3.3V | Modern drives/PCIe | Orange | | 13 | +12V_SENSE | Voltage feedback | N/A | | 14 | +12V_SENSE | Voltage feedback | N/A | | 15 | GND | Ground | Black | | 16 | GND | Ground | Black | | 17 | Reserved | Unused (Do not connect) | N/A | | 18 | PSON_Return | Ground for sense circuit | N/A | 1 x PCIe Gen2 x4 (Slot 3 - open-ended)
This diagram and description serve as a functional map for technicians, upgraders, and BIOS modders working on the HP Z440.