The Intel® Ethernet X520 10 Gigabit Mezzanine Card from Dell™ provides ultimate flexibility and scalability in virtual and unified storage environments. Intel® Virtualization Technology for Connectivity (VT-c) is a suite of hardware assists that reduces I/O bottlenecks in a virtualized server and improves performance, flexibility and virtual machine scalability. Using emulation mode or direct access mode, it improves overall system performance by lowering the I/O overhead in a virtualized environment. This optimizes CPU usage, reduces system latency, and improves I/O throughput. In emulation mode, Virtual Machine Device Queues (VMDq) optimizes network performance by offloading data sorting and copying from the software virtual switch in the VMM to the Intel Ethernet 82599 10 Gb controller.