The Intel(R) 4th Gen Core processor PCI Express x16 Controller - 0D01 driver refers to a specific driver for the PCI Express (PCIe) controller integrated into Intel 4th generation Core processors (also known as Haswell processors). This controller is responsible for managing the communication between the CPU and devices connected to the PCIe slots on your motherboard, such as graphics cards, network cards, or storage devices.

The 0D01 identifier likely refers to a specific version or component ID related to the PCIe controller, often used for troubleshooting or identifying hardware components within Windows Device Manager.