ram memory

Hey i am not pretty sure ,but could someone tell me what is better for my laptop , i have an 8 gb ram 1600mhz and one of 4 gb running 1300mhz , both of them working on this frequency as it is smaller , should i remove the 4 gb ram and stay to 8 ?. or would it be worse:| right now i have 12 gb but's is look like it not even use over 8 gb of ram...
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