Apple Insider claims Apple is going to use NVIDIA GPGPUs in its Mac computers:
Short for general-purpose computing on graphics processing units, GPGPUs are a new wave of graphics processors that can be instructed to perform computations previously reserved only for a system's primary CPU, allowing them aid in the speed of non graphics related applications.
The technology -- in Nvidia's case -- leverages a proprietary architecture called CUDA, which is short for Compute Unified Device Architecture. It's currently compatible with the company's new GeForce 8 Series of graphics cards, allowing developers to use the C programming language to write algorithms for execution on the GPU.
GPGPUs have proven most beneficial in applications requiring intense number crunching, examples of which include high-performance computer clusters, raytracing, scientific computing applications, database operations, cryptography, physics-based simulation engines, and video, audio and digital image processing.