HP
864639-001
is compatible in the following HP Models:
Intel Xeon Processors
HP Z640 XEON E5-2609V4 1.7GHZ 1866MHZ 8 CORE 2ND CPU - T9U11AA
HP Z840 XEON E5-2609V4 1.7GHZ 1866MHZ 8 CORE 2ND CPU - T9U28AA