For GUI-based installation of the Solaris 10 10/09 OS, the system should have a minimum 768 MB of memory. If the physical memory is less than 786 MB, an error message similar to the following is displayed and the installation switches to text installation.
Not enough memory for graphical installation. Graphical installation requires 768 MB of memory. Found 640 MB of memory. Reverting to text-based installation.
Workaround: Ensure that you have 768 MB of memory for a GUI-based installation or upgrade.