Old MacBook Pro Gets a Core 2 Duo Upgrade
A Hackaday piece describes upgrading a MacBook Pro by replacing its original Core Duo with a Core 2 Duo from a dead motherboard, a process that requires desoldering and careful preheating due to moisture ingress; after a firmware update the system recognizes the new CPU, and the article notes these older machines can run open firmware and serve as Linux machines despite hardware limits.