661-3978 SDRAM, 1GB, DDR2-667, SO-DIMM - Core Duo 17inch 2.16GHz Macbook Pro A1151 NB-4293W
This is a 1GB DDR2 PC5300 SODIMM for many models of the Macbook, Macbook Pro, Mac Mini, iMac, etc..
Apple part number: 661-3978
Compatible models: PreUnibody-A1151, MA092LL/A,
Compatible Mac info. : 2.16GHz Core Duo 17-inch Macbook Pro
661-3978 SDRAM, 1GB, DDR2-667, SO-DIMM - Core Duo 17inch 2.16GHz Macbook Pro A1151