Epson Stylus Pro 4000 Reference Manual page 334

128 MB available memory
60 MB free disk space
Note:
The amount of available memory varies according to the number and
kind of applications that are open. To see how much memory is available,
choose About This Computer from the Apple menu and refer to the
memory size (listed in kilobytes) under "Largest Unused Block" (1,024
K = 1 MB).
For Mac OS X
Your computer should also meet the following system
requirements:
Minimum system
Computer that can run Mac OS X
10.1.3
Mac OS X 10.1.3 or later
128 MB or more available memory
60 MB or more free disk space
Note:
To see how much memory is available, choose About this Mac from
the Apple menu.
334
Product Information
256 MB or more available memory
2 GB or more free disk space
Recommended system
PowerPF G4 800 MHZ or higher
processor
Mac OS X 10.2.3 or later
256 MB or more of available
memory
2 GB or more free disk space