Quadro 4000 - problems with antialiasing?

I’ve tried to make a search, but i can’t find a solution

I use the Quadro 4000 for Mac with the HP Dreamcolor LP2480zx monitor.

But… the text (menu, icons, windows, etc) appear with no antialiasing.
At this level, the Quadro 4000 card seems to be pretty unusable. I get a slightly better text display using the DVI output or DVI adapter rather than the Display Port, but I’m really disappointed

Is there a solution?

Mac OS X v10.6.6
Nvidia Driver Version: 256.01.00f03


May be useful