You are purchasing of Lot of 4 USED Kingston KVR266X72RC25/1024 1GB PC2100 DDR-266MHz Registered ECC CL2.5 184-Pin DIMM 2.5V Memory Modules.  Please note we have 2 different chipset types - Qimonda and Infineon (all same model/specs - see pics).  If you prefer a specific chipset please let us know.