Intel EXPI9404PTLBLK PRO/1000 PT 4-Port Low Profile PCI-E Server Adapter, Bulk Load balancing: Increases performance on multi-processor systems by efficiently balancing network loads across CPU cores when used with Receive-Side Scaling from Microsoft or Scalable I/O on Linux Intel I/O Acceleration Technology (Intel I/OAT): Accelerates I/O with higher throughput and lower CPU utilization by offloading processing overhead. Compatible with x4, x8, and x16 full-height PCI Express slots: Allows quad-port operation in almost any PCI Express server slot, except x1 slots, and allows each port to operate without interfering with the other Support for most network operating systems (NOS)