A CPU will not work on anything but the socket it is designed for. It won't even fit in the socket. The exception of this is AMDs newer sockets: AM2, AM2+ and AM3. AM3 cpus are backwards compatible into AM2+ boards and some AM2 boards. AM2+ and AM2 are interchangeable.
The 4000+ is an AM2 CPU. There are three models with minor differences.http://www.cpu-world.com/CPUs/K8/TYPE-Athlon%2064%20X2.html