What is “enough” is highly dependent on your personal circumstances and requirements, and the type of plugins that you use - e.g. size of the sample libraries, etc. There is a “Hardware” Category and “Gig Performer on Mac OSX” Category here in this forum that I would highly recommend that you review - your question has been asked many times by many people over many years, and the discussions can be very illuminating. You will find that many of the discussions in these two Categories have links to other information that would be relevant to you and worth reading. To get you started, use the link below for one of the more recent questions like yours.
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