The $999 MacBook is no longer the lame duck of Apple's laptop lineup—well, not so much anymore. Apple has upgrade the notebook with the same integrated graphics chipset featured in pricier aluminum MacBooks: Nvidia's GeForce 9400M.
Apple's most affordable laptop continues to feature DDR2 memory, a 120GB hard drive, and a white polycarbonate shell, compared to DDR3, 160GB of storage, and an aluminum "unibody" enclosure for the $1,299 model. The upgrade from Intel integrated graphics to the GeForce 9400M should make quite a difference, though, especially in light of Apple's plans to support the (now-complete) OpenCL spec in the next Mac OS X release.
Nvidia plans to have full OpenCL support in CUDA-capable GPUs (including the 9400M) in the second quarter of this year, and it doesn't hide the link between that and its partnership with Apple. OpenCL will allow developers to write general-purpose apps that can run on both AMD and Nvidia graphics processors, as well as other devices like digital signal processors.