You would hardly notice a difference between 8 and 16. You would only notice if you have a lot of programs open at the same time and then you switch to one that wasnt active for a long time (so it was paged to the hard drive). On 16 gb you would need to have twice as much programs open before you would notice it taking longer to switch back to a program that wasnt active in a long time.
For OCing more ram is worse if you get 4x4 because more sticks is less stable.
Edited by Sisaroth - 9/29/13 at 4:10am