Giz Explains: Why Does the New MacBook Pro Have Two Graphics Cards?

The biggest update to the new MacBooks—on the inside anyway—is their graphical muscle, which has been hooked up with some Barry Bonds-level steroids. Apple ditched Intel's crummy integrated graphics and chipset (basically the traffic controller between the processor and everything else) entirely, opting for a new one from Nvidia that combines the chipset and a GPU on a single chip—the GeForce 9400M. The MacBook Pro, being more Pro-erer than the MacBook, now rocks two graphics cards—the integrated 9400M and a separate, beefier GeForce 9600M GT. If that swirl of numbers, letters and BS is confusing, here's what's up.