Connect X-4 from Mellanox is a family of high-performance & low-latency Ethernet & Infini Band adapters. The Connect X-4 Lx EN adapters are available in 40 Gb & 25 Gb Ethernet speeds & the Connect X-4 Virtual Protocol Interconnect (VPI) adapters support either Infini Band or Ethernet. This product guide provides essential presales information to understand the Connect X-4 offerings & their key features, specifications, & compatibility. This guide is intended for technical specialists, sales specialists, sales engineers, IT architects, & other IT professionals who want to learn more about Connect X-4 network adapters & consider their use in IT solutions. Connect X-4 from Mellanox is a family of high-performance & low-latency Ethernet & Infini Band adapters. The Connect X-4 Lx EN adapters are available in 40 Gb & 25 Gb Ethernet speeds & the Connect X-4 Virtual Protocol Interconnect (VPI) adapters support either Infini Band or Ethernet. These adapters address virtualized infrastructure challenges, delivering best-in-class performance to various demanding markets & applications. Providing true hardware-based I/O isolation with unmatched scalability & efficiency, achieving the most cost-effective & flexible solution for Web 2.0, Cloud, data analytics, database, & storage platforms. The following figure shows the Mellanox Connect X-4 2x 100 Gb E/EDR IB QSFP28 VPI Adapter (the standard heat sink has been removed in this photo). Virtual Protocol Interconnect (VPI) enables standard networking, clustering, storage, & management protocols to seamlessly operate over any converged network by leveraging a consolidated software stack. Each port can operate on Infini B&, Ethernet, or Data Center Bridging (DCB) fabrics, & supports Ethernet over Infini Band (Eo IB) as well as RDMA over Converged Ethernet (Ro CE). VPI simplifies I/O system design & makes it easier for IT managers to deploy infrastructure that meets the challenges of a dynamic data center.