I have a home-built PC (thanks to the great folk on these forums ) and it is now 18 months old and feels sluggish. I know that happens over time as you load more and more programs, but was wondering if an increase in RAM from 6gb to say 12gb would make a worthwhile difference, as it is fairly cheap? I have a Asus P6X58D-E motherboard with 3 x 2gb modules of RAM (Corsair DDR3 1600MHz) and am running Windows 7 Professional 64bit. Also, I have 3 RAM slots remaining, should I try and fill that with the same (or as close to the same) memory that I can find, or would it be better say to stick in a 1 x 6gb module? Thanks, in advance.