NVIDIAs NVLink 3.0 is a high-bandwidth, energy-efficient interconnect technology designed for Ampere based GPUs to facilitate faster data exchange between the CPU and GPU, as well as between multiple GPUs. This is the 2 slot version for when there is no empty slots between 2 slot cards. If you have one or more empty slots between the cards or the cards are 3 slot this NVLink will not work. See the attached images showing the card layout.