The Broadcom BCM957508-P2100G is a dual-port 100GbE PCIe network adapter for enterprise and data-center Ethernet connections. This is a third-party Broadcom product, not a Synology-branded card; suitability for a particular Synology server must be checked against the official device compatibility matrix.
Compatibility and ordering note: Broadcom part number BCM957508-P2100G. Synology compatibility is model-dependent; do not assume official certification. Confirm the adapter firmware, card size and QSFP56 optics or DAC cables before ordering.