HP Processor Upgrade AA651B is compatible in the following HP Models:

Intel Xeon Processors

INTEL XEON 2.80GHZ/2MB 800FSB 2ND PROCESSOR - AA651B

HP Workstation xw6000

HP XW6000 WORKSTATION - DS453AW

HP XW6000 WORKSTATION - DS454AW

HP XW6000 WORKSTATION - DV003C

HP XW6000 WORKSTATION - DV067ES