···8080 If you have one of the following DECstation Models you definitely8181 want to choose R4xx0 for the CPU Type:82828383- DECstation 5000/508484- DECstation 5000/1508585- DECstation 5000/2608686- DECsystem 5900/2608383+ DECstation 5000/508484+ DECstation 5000/1508585+ DECstation 5000/2608686+ DECsystem 5900/26087878888 otherwise choose R3000.8989