Kind of how you'd install an operating system, automatically receive some baseline functionality using least-common-denominator hardware drivers, then install specialized drivers for your machine's video, sound, and networkcards?
Customers may also pre-install other high performance components to the servers from the factory, including low latency networkcards, high performance memory, and hot swappable front-facing PCIe SSD storage.
The standard's global deployment is pervasive, and the span of stakeholders in its ongoing development is sweeping, including network component and system manufacturers (optical transceivers, cabling, integrated circuit, powering devices, switches and network interface cards, for example) and network, software and bandwidth providers, as well as LAN and Internet users worldwide.