@Earther Thanks for contacting us. This memory module is a 1GB DDR2 PC2-6400 800 mhz Ballistix RAM module. The part number for it is BL12864AA804. CL11186.J4 is the batch number and 72596 is the material number. It is a 240- pin DIMM. Please let us know if you need any further specifications or have any other questions.