This was a very specific update:
The Mac OS X 10.6.4 Update is recommended for all users of Mac mini (Mid 2010). This update contains all the applicable fixes from the Mac OS X 10.6.4 Update, plus the following specific fixes for Mac mini (Mid 2010):
- Resolves compatibility and performance-related graphics issues.
- Improves compatibility with large-format SDXC memory cards.