Lenovo 4XH1L18997 2-Way NVLink Graphics Bridge

Overview

The Lenovo 4XH1L18997 is a 2-way NVLink bridge accessory that connects a pair of compatible NVIDIA graphics cards in supported Lenovo workstation platforms. The 4XH1L18997 enables direct GPU-to-GPU interconnect — bypassing the CPU and PCIe bus for memory transfers between cards — which matters when running workloads that need unified GPU memory addressing across two discrete cards. At 47.4 mm deep, 50.3 mm wide, and just 5.44 mm tall, the bridge fits within the tight card-to-card spacing found in tower and rack workstations.

Compatibility

This bridge is designed for Lenovo-qualified workstation configurations that support 2-way NVLink. NVLink bridge compatibility is generation-specific: the physical connector pitch and number of fingers vary between NVIDIA GPU generations (Turing, Ampere, etc.), so confirm the bridge generation matches your GPU before ordering. Consult Lenovo's workstation configurator or options compatibility matrix for your specific ThinkStation model to verify 4XH1L18997 is the correct bridge for your GPU pair. Using a mismatched bridge generation will result in a physical fit failure — the connectors will not seat.

Installation Notes

The bridge slots directly onto the NVLink connectors on the top edge of both GPUs. No tools are required for the connection itself, but both PCIe slots must be populated with compatible cards before installing the bridge. Ensure the workstation is fully powered down and discharged before handling. The package weight is 800 g including packaging; the bridge itself is lightweight. CE compliance is confirmed for this part number.