Recently, NVidia indicated its interest for open CL, but the company was actively developing its proprietary API known as CUDA. However, a recent information indicates that NVidia is indeed very active on the open CL side. The company just made available to developers a pre-release version of its drivers able to manage natively Open CL. A complete SDK should follow during the year.
This is an excellent news for Apple as Open CL is now the basis of GPU management in the forthcoming Snow Leopard. It is quite obvious that Apple has been asking NVidia to natively support the Open CL standard with its current and forthcoming GPU, and the recent announcement of the Quadro FX 4800 for Mac Pro is for sure a sign.
So, everything looks good for Apple and its future Mac OS X version as it will be able to manage GPU power at will independently of the graphic card manufacturer. Indeed, the latest will have to bring optimized drivers and support for Open CL otherwise they would lose the Mac marke