Does 500mb ram make a difference?

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hi,
have macbook pro 15inch (not unibody) model a1150, 1,5gb of ram.
wondering if making 2gb bring significant change in therm of speed?
advices or comments appreciated :)

ps : run mac osx 10.5 leopard on it.
 

it make bit faster. have though upgrading more secure os such snow leopard?
 


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