You can control whether you use one graphics core or two graphics cores in the System Preferences. When you use one graphics core, you always use the same one. When you use two cores, both cores are active. You cannot control which core you use when you're only using one core... you will always use the same, single one (which I believe is the 9400M).
http://www.apple.com/macbookpro/graphics.html
The new MacBook Pro combines the efficiency of an integrated graphics processor with the desktop-class performance of a discrete graphics processor. That’s because it has both. Out of the box, it runs the integrated NVIDIA GeForce 9400M processor, which provides plenty of performance for everyday use with up to 5 hours of battery life.* But when you need turbocharged performance for the most graphically intensive tasks, the discrete NVIDIA GeForce 9600M GT processor delivers. And thanks to a new graphics architecture, it’s easy to switch between these two processors.
The differences between the MacBook and the MacBook Pro are many:
- Bigger screen on the Pro
- FireWire ports on the Pro
- Graphics cores on the Pro
- CPU speed on the Pro
- Backlit keyboard on all Pro models
- etc.
You can do your own comparisons by going to both these pages and reading about the features of both computers, then seeing for yourself what is different:
http://www.apple.com/macbook/
http://www.apple.com/macbookpro/
...or did you want someone to do all that for you?
Apple did not update the 17" MacBook Pro probably because of manufacturing troubles with the 17" LED screen or something. Rest assured, the 17" will be updated in due time.
On a different note, I hate how the Macbook looks like the macbook pro. I know why apple did that-its because they sell more macbooks then pro's so they like care about the regular macbook owners being happy much more then the macbook pro owners but for someone like me who can pay the extra money, it does suck because I don't feel anymore special.
That's one opinion -- but I highly doubt that Apple cares about MacBook owners more than MacBook Pro owners. If the CEO of Apple were 12 years old, I could understand that, but these are grown men and women we're talking about. They have more business expertise than you or I have, and even when a decision looks "stupid" or "ridiculous" to us, most of the time it's because we don't know what we're talking about. The MacBook owners were perfectly happy when they had white and black models instead of aluminum colored models. I highly doubt Apple changed them from white/black to aluminum in order to make the Macbook owners "happier."
Case in point: pricing the original 5GB iPod at close to $500. "No one will buy it!" "There are plenty of MP3 players out there already!" "It's doomed to fail!" "Apple doesn't know the first thing about music!"
I sure hope the nay-sayers were wearing tasty shoes that day because I highly suspect that a lot of market researchers and reviewers had their feet in their mouth shortly after the iPod introduction.
The same goes for the iPhone. Now it commands over 30% of the smartphone market. Not such a bad product after all, huh?
You don't feel special because the new MacBook now resembles the MacBook Pro? How does that make you feel less special? Does it also make you mad that the MacBook's and MacBook Pro's screen now resembles a portable version of the iMac screen? Oh, no! Now you and your MacBook Pro are no better than an iMac! :O