BIOS Memory Settings

For a system dedicated to general office work, and that has 16GB of RAM, what should I set these IGP related settings to:

Internal Graphics Memory Size: 32M-1024M (64M Default)

DVMT Total Memory Size: 128,256 or MAX (MAX Default)

(Gigabyte terminology)

Aero performance feels poor compared to my systems with dedicated GPUs, and there is a screen 'tearing' effect during the fade transitions in the log in/log off screens.