4.3 OS is 8GB
Search for pjtaylor he did a nice chart but bottom line, your OS determines max card. If you can't find, I will and post back. Good luck,
BLACKBERRY OS VERSION
Media Card Size Limit
BlackBerry Device Software 4.2.0 Up to 2GB
BlackBerry Device Software 4.2.1 Up to 4GB
BlackBerry Device Software 4.2.2 Up to 4GB
BlackBerry Device Software 4.3.0 Up to 8GB
BlackBerry Device Software 4.5.0 Up to 8GB
BlackBerry Device Software 4.5.0.81 and Up Up to 16GB
BlackBerry Device Software 4.6.0 Up to 16GB