GTX560, (non TI),
I had to add the pci id 120110de of the card in the NVDA... kext in the unibeast USB key, I used GraphicsEnable=Yes and PCIRootUID=0 (instead of 1 in Lion).
work well, boot directly to 2560x1440 (27" display DVI),
with the Multibeast GTX5xx patch for opencl, I am able to run luxmark on the card (got around 800 something for Sala I think).
Globally ML is stable, more responsive than ML on my I7-920, i like it, no bad experience, no rolling beach ball like in Lion.
I had to disable sleep in PowerManagement as my PC go brain dead in sleep (never able to wake it up) and the GTX550 cards
seems to have trouble with sleep too.
The PC is up evening and night and most of the weekend under ML, the screen go to sleep after 15mn.
I will still try to tweak it a little with MultiBeast 5, perhaps try to enable my in board sound card (I used a usb DAC sound card).
Will look at the updated customac for ML to make my next hackintosh beast, i7-920 seems now a little old !