If you have a lower please feel free to try but I would recommend lowest 8 gb.
Sync settings is very very bad. My pc 4gb 1300mhz RAM i3 2350m :/
I'm not sure what's wrong but I have an 8gb myself and there's no frame drops on max settings. probably has something to do with your Processor/Graphics card. Would you please post your system? you should have when asking questions like this.
