Is thinking that one component if sped up can make all the difference. It's true to some point but too often it only shows in benchmarks and well, gamers bleed pints for ONE MORE FRAME PER SECOND.
You can get farther by picking a better video card for games and even farther by using fine lists like
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
I'm guessing this is for gaming. I would get the 16GB, and some i7 CPU then go far up that list as possible. The result will be great without any need of overclocking.
(new)
"Our tests demonstrate fairly little difference between a $225 LGA 1155 Core i5-2500K and a $1000 LGA 2011 Core i7-3960X, even when three-way graphics card configurations are involved. It turns out that memory bandwidth and PCIe throughput don't hold back the performance of existing Sandy Bridge-based machines. "
http://www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106-4.html
This is why I really like to ask folk why they are overclocking.
Bob
I'm building a computer soon and I would appreciate some advice such as, what ram do I want, what graphic card or what CPU I should get. This computer will be used for gaming and multimedia. I already have my case 'Fractal Design Define R4' so it would all have to fit in that. I have 700 to 900 to spend on parts. Thanks if you read this and reply, it'll be much appreciated. 
I'm new on this site as well still getting around how to use everything.
Chowhound
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TechRepublic