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For example, if you were looking to some of the speed boosting technology that Apple featured in the keynote with your Intel Mac, namely OpenCL and H.264 Video Acceleration, you could be out of luck. OpenCL is only supported by the following graphics cards:
NVIDIA Geforce 8600M GT, GeForce 8800 GT, GeForce 8800 GTS, Geforce 9400M, GeForce 9600M GT, GeForce GT 120, GeForce GT 130, ATI Radeon 4850, Radeon 4870.
These graphics cards are all dedicated ones, which means all Macs with Intel Integrated Graphics will not be able to take advantage of the improvements.
H.264, on the other hand, will only work with Macs with NVIDIA 9400m GPUs, which is essentially limited to the unibody line of MacBooks.
This is a huge disappointment, because OpenCL is one of the key speed boosters in Snow Leopard, as it allows programs to use power from the GPU when it is not in use. H.264 acceleration is mainly used to improve video playback, as it uses the GPU to encode and decode video instead of using the CPU. This frees up the CPU for other use.