The first Intel Macbook Pro in Early 2006 was Core Duo (32-bit), then in October they reved them with Core 2 Duo (64-bit w/ 32-bit EFI). I remember specifically

The first Intel Macbook Pro in Early 2006 was Core Duo (32-bit), then in October they reved them with Core 2 Duo (64-bit w/ 32-bit EFI). I remember specifically because I had to wait out the first couple months of my freshman year of college without a laptop, waiting for that 64-bit support that was supposed to drop at any time...