Ram upgrade Question!

will upgrading ram 4gb 8gb increase gaming experience.
have mac book pro 4gb ram, 2.0 ghz intel core i7 750 gb hard disk.
running x plane on it
if increase ram 4 gb 8 gb, see increase n performance . find little bit slow if played settings.
please suggest guys

 

affect of 4gig ram 8gig ram upgrade on gaming performance?

 

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