Rob-Art from Barefeats used the new Open CL benchmark application, Galaxies, to test most of NVidia graphic cards with Open CL. This new application is much more complete than Open CL Benchmark as it uses a graphical interface and is able to evaluate the GPU alone and associated with CPUs. At the end of the game, the GeForce GTX 285 is the fastest in a Mac Pro Nehalem, about twice faster than a GF 8800 GT and 5 times faster than a GF 120GT.
Be careful if you plan to use this benchmarking applications, it could b-not boot on a Mac Pro 2008 sporting a Radeon, and even generated a Kernel Panic on a MacBook Pro 15" (2009).
