Yes, Illustrator can run on 4GB RAM, but it is not recommended. Adobe recommends a minimum of 8GB RAM for Illustrator, and 16GB RAM is recommended for optimal performance.

If you only have 4GB RAM, you may experience performance issues when running Illustrator, especially if you are working on complex projects or using multiple features at the same time. You may also need to close other programs that are running in the background to free up RAM for Illustrator.

Here are some tips for running Illustrator on 4GB RAM:

• Close any other programs that are running in the background.
• Use a smaller workspace layout.
• Disable unnecessary features and panels.
• Save your work frequently.
• Use a preview image instead of a live preview when working with effects.
• If you are working on a large or complex project, consider breaking it down into smaller projects.

If you find that Illustrator is running too slowly on 4GB RAM, you may want to consider upgrading your RAM. This is the most effective way to improve Illustrator’s performance.