>value in adding an SSD for media
Having at least TWO drives is better than only one drive... and since an SSD uses less power than a spinning platter drive, you should be OK with your power supply
An EXAMPLE concerning trying to use only ONE Hard Drive for Video Editing
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You are a music conductor, with a baton that you use to point to various parts of the orchestra... this is like the operating system pointing to various parts of the hard drive to do file housekeeping or to load program segments for various functions
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Now, at the same time and with the same hand... while still using the baton to conduct the orchestra... pick up a bow and play a fiddle... this would be doing something with your video file at the same time as all the other work
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You as a person cannot do both at the same time with the same hand
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A computer is a LITTLE better, in that it can switch from one kind of task to another very quickly... but not quickly enough for EASY video editing