Videoadapterid

Videoadapterid is a term used to describe a unique identifier assigned to a video adapter (graphics card) within a computer system. It serves to distinguish between GPUs in the same machine and is used by operating systems, drivers, and applications to map configuration, resources, and preferences to the correct device. This identifier underpins tasks such as selecting a specific GPU for rendering, caching driver-specific data, or applying user settings to the appropriate hardware.

Form and scope of the identifier vary by platform. In many environments, the ID is derived from the PCI device information, often expressed as a combination of a vendor ID and a device ID, and may be augmented with subsystem vendor and device IDs. Some systems expose a more abstract or canonical string, sometimes including a GUID, that uniquely associates with a particular video adapter. Virtualized or cross-platform layers may generate a higher-level logical ID to track the adapter across driver updates or reconfigurations.

Acquisition and usage follow standard hardware enumeration practices. Applications and system utilities typically obtain the videoadapterid through platform APIs that enumerate display devices, such as PCI bus inspectors, device manager interfaces, or graphics APIs. The ID is used to route rendering commands, select appropriate drivers, and persist per-device settings across sessions. It also helps software adapt behavior to the capabilities of the specific GPU.

Limitations exist: IDs can change after hardware changes or driver updates, and different APIs may present the identifier in different formats. In systems with multiple GPUs, each adapter has its own videoadapterid, and in virtualized environments, virtual IDs may be assigned to virtual GPUs.

See also: PCI device ID, GPU driver, display enumeration, DirectX/OpenGL hardware querying.