It has 8GB of 1600MHz DDR3 memory. It should be absolutely sufficient for Adobe Illustrator and the other tools for the next few years, unless you are working on very complex projects involving huge content (e.g. 4K video/very big photos). In the later case, you
might benefit from 16Gb RAM. I also recommend you to have a look at these
benchmarks. They do not detect any difference between the 8Gb vs. 16Gb system, until they start benchmarking a huge (20000 pixels wide) image.