On my MacBook Pro GeForce 9600M GT works perfect. SH3 + GWX 3.0 + SH3 Commander. You can try to run (if you have), the "run display optimization wizard" which you can find at the NVIDEA desktop manager or NVIDEA settings.
System requirements for nHancer
- Any nVidia GeForce graphic card
- Windows 2000, XP, 2003 or Vista (32 and 64bit)
- Forceware driver version 60 or higher (nHancer 2.4.5)
- Forceware driver version 182 or higher (nHancer 2.5.1 or later)
- MS .NET Framework 3.5 or later
Download here:
http://www.nhancer.com/?dat=downloads
Manual:
http://www.nhancer.com/?dat=d_introduction#Starting