tiny voices said:
2x4gb is always better. You could gran another 8gb stick and run 16gb. Dual channel RAM will always be faster.
How much faster are we talking about? 50% faster, 30%, 20%? I know most games don't need more than 4gb, and the only thing I will be using this computer for is school work, browsing the internet, and playing games. No photoshop, video editing, etc.