If you've opted for Multi-Sample Anti-Aliasing (MSAA) in Grand Theft Auto V, you can enable NVIDIA Multi-Frame Sampled Anti-Aliasing (MFAA) via the NVIDIA Control Panel. This new GeForce GTX 900 Series-exclusive anti-aliasing technique appears almost identical to MSAA, yet runs 10-30% faster, improving your frame rate and giving you the option to enable additional effects.
To activate MFAA, choose the following settings in the NVIDIA Control Panel: