Recently one of my RAM stick was having problem and causing tons of BSOD so I took it out after testing each of the 4 RAM. I'm currently using a z77 board so theres 4 RAM slots and i use 3 RAM sticks atm ( 12 GB total ). I would like to know that why does it affect my performance? When doing the windows experience index with 3 RAM , it says 7.6 for my RAM and when I use only 2 stick of RAM , i get a 7.9 score. Also I tend to hang a lot on youtube when using 3 stick of RAM , its either adobe flash player hanging or firefox hanging. Does using 3/4 RAM slots really cause more problem as it is only suited for 2 or 4 sticks of RAM?