The OptiPlex 780 utilizes the Intel Q45 Express Chipset. Business-class machines like the OptiPlex series include for remote management. Part of this technology allows IT administrators to access the computer remotely via a serial connection over the network, even if the computer is turned off or the operating system has crashed.
| Chipset | Recommended OS | Driver Source | |-----------------------|-------------------------------|--------------------------------------------------------------------------------| | MosChip MCS9865 | Windows 7 / 10 (32‑bit only) | Official MosChip site (last updated 2013) – no official 64‑bit Windows 10 driver | | OXPCIe952 (Oxford) | Windows 10/11 64‑bit | Use built‑in serenum.sys / serial.sys after forcing hardware ID in .inf | | FTDI FT4232H (4‑port) | Windows 10/11 64‑bit | FTDI’s official VCP driver – fully signed, works well with OptiPlex 780 | | Startech 1P model | Windows 10/11 64‑bit | Startech provides signed drivers for their cards based on the above chipsets | optiplex 780 pci serial port driver
The most reliable way to obtain this driver is directly from Dell Support . The OptiPlex 780 utilizes the Intel Q45 Express Chipset
If the Dell driver installer claims your hardware is unsupported, you must force-install it using the Hardware ID. | Chipset | Recommended OS | Driver Source