To be honest with you, I would go as far as saying 6GB is fine for the next few years. 16GB is far overkill I have never seen use above 5GB so that says it all![DOUBLEPOST=1358688474,1358688397][/DOUBLEPOST]
That's a little too old, I would say a 400 serious Nvida card would suit you will, cheap as chips right now!