Some OpenCL benchmarks...
Quote:
The benchmark runs on each device showing the relative performance. Most interesting is that for owners of high end MacBook Pros which contain both 9400M and 9600M GT graphics cards, both GPUs can be used at any time by OpenCL. In contrast, both of these GPUs can not be used for general graphics processing and requires a Mac OS X logout to switch from one to another.
In this particular example, the benchmark performance of the user's MacBook Pro CPU and two discrete GPUs were as follows (smaller numbers faster):
GeForce 9600M GT: 2.805 seconds
GeForce 9400M: 3.081 seconds
Intel Core 2 Duo @ 2.40GHz: 15.459 seconds
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http://www.macrumors.com/2009/08/30/...book-pro-gpus/