This lot contains four Hynix 8GB (4x2GB) 2Rx4 PC2-5300F-555-11 HYMP525F72CP4D3-Y5 398707-051 memory modules. These modules are compatible with HP systems and are DDR2 SDRAM with a bus speed of PC2-5300 (DDR2-667). The total capacity of this lot is 8GB, with each module having a capacity of 2GB. The form factor is DIMM, and this lot is suitable for use in computer systems and other related devices.