Externally, the new MacBook Pros are identical to the early 2011 models. The glossy LED backlit screens each measure 13.3-, 15.4-, and 17-inches diagonally, with 1280-by-800, 1440-by-900, and 1920-by-1200 pixel resolutions, respectively. All systems have a full-sized, backlit keyboard, as well as glass multi-touch trackpads with gesture support.

The FaceTime HD webcam, stereo speakers and built-in microphone remain the same, as do the number of ports on every model: one FireWire 800, one Gigabit Ethernet, a MagSafe power connector, and one audio in and one audio out port. The 13- and 15-inch models have two USB 2.0 ports and a SDXC card slot. The 17-inch model has three USB 2.0 ports and an ExpressCard/34 slot. All of the new MacBook Pros have a Thunderbolt port, which was introduced in the early 2011 models

In terms of performance, the differences between the latest MacBook Pros and their immediate predecessors are, for the most part, as subtle as the upgrade announcement. The new $1199 13-inch 2.4GHz Core i5 MacBook Pro is just a little over 4 percent faster than the 2.3GHz system it replaces. The $1499 13-inch 2.8GHz Core i7 model is about 9 percent faster than the system it replaces.

The most interesting results were in our Photoshop and Aperture tests, which are both faster on the older systems. According to Apple's , the MacBook Pro may adjust processor speed to avoid running into thermal issues. That could be happening in these tests. It's also possible that the hard drives may be affecting the results.