Does adding more RAM to a system improves a game's performance?

have 2 gb gddr5 gt650m on alienware m14x r2 6 gb ddr3 ram. thinking of adding 8 gb stick improve ram 12 gb (by removing 2 gb stick). wanted know whether improve gaming performance, i'm having issues hitman absolution on high/ultra settings (dropped framerates, don't know why) while of games give decent framerates on highest settings. help!!

i have 2 gb gddr5 gt650m on alienware m14x r2 6 gb ddr3 ram. thinking of adding 8 gb stick improve ram 12 gb (by removing 2 gb stick). wanted know whether improve gaming performance, i'm having issues hitman absolution on...

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