Starting in October of 2006, Apple updated the 15- and 17-inch MacBook Pro models with the Intel Core 2 Duo processor. This is a 64-bit processor, which should ensure these MacBook Pros have a long life ahead of them. It also makes them good upgrade candidates. You can extend the effective lifetime of one of these MacBook Pros by adding memory or a larger hard drive, or replacing the optical drive.
The MacBook Pro offers a wealth of upgrade options, including those sanctioned by Apple as user upgradeable, and those that are DIY projects Apple never intended end users to perform.
Memory and battery replacement are both sanctioned user upgrades, and are easy to do. If you want to upgrade the hard drive or replace the optical drive, you'll find these tasks are also fairly simply to perform, even though Apple doesn't support them as user upgrades for the MacBook Pro. If you're comfortable wielding a screwdriver, you can easily change out a hard drive or optical drive.
MacBook Pro Upgrade Information
Model identifier: MacBook Pro 2,2, MacBook Pro 3,1, MacBook Pro 4,1
Memory slots: 2
Memory type: 200-pin PC2-5300 DDR2 (667 MHz) SO-DIMM
Maximum memory supported (MacBook Pro 2,2): Apple lists 2 GB total. Use matched pairs of 1 GB per memory slot. The MacBook Pro 2,2 can actually address 3 GB of RAM if you install 2 matched pairs of 2 GB.
Maximum memory supported (MacBook Pro 3,1 and 4,1): Apple lists 4 GB total. Use matched pairs of 2 GB per memory slot. The MacBook Pro 3,1 and 4,1 can actually address 6 GB of RAM if you install one 4 GB module and one 2 GB module.
Hard drive type: SATA I 2.5-inch hard drive; SATA II drives are compatible.
Hard drive size supported: Up to 500 GB