I have a Dell XP8500 with 2GBx2, 240-pin DIMM, DDR3 PC3-12800 memory modules. I am thinking that an increase to a total of 8 GB would be of some benefit. I understand that it is better to have just 2 sticks of 4GB each but this is an expensive & wasteful way of doing it.Is it possible please do say what the performance hit is of having 4 rather than 2 sticks.My interest is Flight Simulation