Part A9873A is compatible in the following Models:

HPE Integrity rx2600 Servers

HPTC Clsr Svr rx2600 1.5GHz 2GB Solution - A9796B
HPTC Clsr Svr rx2600 1.5GHz 4GB Solution - A9797B
HPTC Clsr Svr rx2600 1.5GHz 8GB Solution - A9798B
HPE rx2600 1.5Ghz channel bundle - AB210A