Capacity: 8GB (Note: The provided description has a discrepancy, stating both '8GB' and '18GB'. Assuming 8GB is the primary specification for the module itself.)
Type: 2RX4 DDR2 SDRAM (This is an assumption based on typical Lenovo server memory configurations for older parts. '2RX4' refers to the memory's rank and organization)
Speed: Not specified in the provided information.
ECC: Not specified in the provided information.
Buffered/Unbuffered: Not specified in the provided information.