Sun Microsystems PCI - GigaSwift Ethernet 1.0 UTP (RJ-45). X1150A & X3150A are the exact same part. Due to availability issues we recomend buying the newer / less expensive model the X4150A-2. X4150A-2 We guarantee it will work in every machine that the X1150A or X3150A worked in. Except, Minimum OS for X1150A, X3150A is Solaris 2.6. Minimum OS for X4150A, X4150A-2 is Solaris 7.