OCZ4001024PDCK 1GB 400 MHz Copper Heatspreader Unbuffered 2.6 Volts Pin DIMM Lifetime warranty from the manufacturer. 1GB (2x512)---400 MHz, CL 2.5-3-3-7, Copper Heat spreader, Unbuffered, 2.6 Volts, 184-Pin DIMM, ULN.