Will adding ram make a difference? (6gb to 12gb)

I think RAM for video reserve only happens when you are using a GPU without VRAM.
As soon you put in a graphic card the reserve should automatically be disabled.
 
Depending on what programs you use is where you will see a difference. When I got my laptop last year it had 6GB installed (1x4GB & 1x2GB) and I decided to swap the 2GB for another 4GB to max it out to 8GB and I haven't really noticed a difference.
 
I'm sure they all do. Since you have 4 gigs of Vram you can turn off the aperture in the BIOS to reclaim your system memory.
 
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