Sun Microsystems has long been synonymous with leading edge technology. Now, after years of telling the world "The Network is the Computer", Sun is poised to become the leader in the emerging network-driven economy. Forward thinking organizations are looking to Sun to lead them into the dot com future. And Sun takes its leadership commitment seriously.Sun SPARC Enterprise Server I/O Tray comes with 4 PCI-E slots and 1 PCI-X slot for use with SPARC Enterprise M5000 and M4000 servers (note, M4000 servers pre-configured with 1 I/O tray maximum), second I/O tray required for M5000 for use of optional DAT 72 drive. RoHS-5.