So I have ordered some more memory today and need to know which slot to place the memory into for maximum peformance of my system. At the moment it has 3gb 2 x 512mb slot 1/2 riser a 2 x 1gb slot 1/2 riser b I have ordered 2 x 2gb taking my total to 7gb But where to put the 2x2gb ?? Should it go it Riser A / B 1/2 ? 3/4 ? Just confused at this stage so any help will be appreciated.