Unified I/O in VMware ESX servers deliver many cost and power savings advantages. 10GigE and InfiniBand are two options, but they pose unique opportunities and challenges that need to be given due considerations. When it comes to unifying server I/O with best price-performance and end-to-end FC SAN connectivity, InfiniBand is the only solution that is deployable today and in the near future. 10GigE adapters are useful when unifying server I/O in iSCSI SAN environments and can provide high throughput for VMs. Mellanox's protocol agile ConnectX adapters deliver on promises in both the InfiniBand and 10GigE worlds, now! And with advanced features such as FCoE and PCI SIG IOV SR built in, ConnectX delivers peace of mind with complete future proofing.