The new nvidia Driver for Mountain Lion 10.8.1 does fix the issues of Fermi card: http://www.nvidia.com/object/macosx-304.00.00f20-driver.html
My GT435m works perfect now!
It will need a new patch for the new GeForceGLDriver.bundle to enable OpenCL in chip GF1x4 GF1x6.
Who qualifies?