Daring Fireball: How to Tell if Your Intel-Based Mac Has a 32-Bit or 64-Bit Processor

By John Gruber

WorkOS: APIs to ship SSO, SCIM, FGA, and User Management in minutes. Check out their launch week.

Core Solo and Core Duo: 32-bit.
Core 2 Duo and Quad-Core Xeon: 64-bit.

★ Thursday, 30 July 2009