The PCI System Device - 3429 is typically an unidentified or generic hardware device listed in Device Manager under the category Other Devices or System Devices when Windows is unable to recognize the specific hardware component associated with it. The number 3429 is the Device ID or Hardware ID for a particular piece of hardware, and in most cases, it corresponds to a PCI device on your motherboard or a component installed on a PCI slot.

This specific device ID, 3429, is commonly associated with certain Intel chipsets, especially Intel I/O controller hubs (ICH) or Intel management components. However, to properly identify the device, you will need to ensure that the correct driver is installed. The PCI System Device - 3429 might represent a variety of components, such as PCI bridge or PCI Express root ports.