I agree. The superfetch feature just makes use of ram that would just sit there otherwise doing nothing. As long as the ram is available to be used when needed and does not result in additional swap file use then its OK.
That being said I would not bother going to 8Gb if you already have 4...a couple of apps MAY open faster (via superfetch) but that would probably be it. If you do go to 8Gb I certainly would not fill up all four ram slots.
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