Originally Posted by sithlord
Seems the big jump was powerbook to macbook pro core duo as opposed to core duo to core duo 2.
That was the monster jump. Every software had to be recoded. Luckily, when they created the Universal code, it was already optimized for multi-threaded processing. So the jump from Core Duo to Core 2 Duo wasn't that big of a leap. The big difference is the 32- to 64-bit processors.