My Macbook details:
2.66GHz Intel Core 2 Duo 4GB 1066MHz DDR3 SDRM-2x2GB 500GB Serial ATA Drive@5400rpm SuperDrive 8X DL MBP 15" Glossy WS Display.
It’s odd that the Apple store charges so much extra $600 for [Apple Memory Module 8GB 1066MHz DDR3 – 2x4GB SO-DIMMs].
NewEgg has compatible memory for $126.99 [Mushkin Enhanced 8GB (2 x 4GB) DDR3 1066 (PC3 8500) Dual Channel Kit Memory for Apple Model 976644A] Just remember to run an extensive hardware test often in the first 60 days.