These wrap cards complete the full QPI mesh to allow all four processors to be connected to each other. The QPI Wrap Cards are not needed in two-processor configurations and not needed when a MAX5 is connected. The QPI Wrap Cards are only for single-node configurations with three or four processors installed. They are not necessary for any of the following items: Single-node configurations with two processors; Configurations with MAX5 memory expansion units and Two-node configurations.