I have recently build a very fast computer and installed 6GB of 2000mhz DDR3 RAM (G.Skill RipJaws).  I am wondering what impact replacing the 6GB with 12 GB of RAM will have on performance.  Has anyone done this that may be able to add some insight?  My biggest concern is screwing up my overclocked setup by adding the additional RAM...what I have is working very well, but I think there is still room for improvement.  Any thoughts/advice would be appreciated.