It has 2 GB / 3 GB RAM options with 16 GB internal storage memory. (techandroids.com)
Remember that this is not an official update, so by manually applying a custom ROM the data which is being saved on the Note internal storage memory might be wiped out. (android.gs)
Part of this is good software design that's not overly heavy and doesn't do too much to constantly stress the system, and another part is the unbelievably fast internal storage memory. (androidheadlines.com)