Lenovo Blowig Rock Riser Option 4XC7A90109 — PCIe riser kit, OCP-ready | Riser, Server

Add PCIe I/O capacity to Blowig Rock servers while preserving thermal and service design. This riser option (MPN 4XC7A90109) installs into the Blowig Rock platform to expose expansion card connectivity in a low-profile footprint, enabling deployment of accelerators, storage controllers, or NICs without redesigning the chassis. The assembly is validated for mechanical fit, electrical signaling, and Lenovo service compatibility so procurement can avoid compatibility risk and extended integration cycles. Choose this factory option to maintain warranty alignment, simplify spare parts management, and reduce field retrofits that disrupt rack-level airflow and cabling. For teams sizing I/O growth across dense server deployments, the riser option delivers predictable performance and operational consistency compared with ad-hoc third-party adapters.