UPDATE!
I just received my 8GB Corsair 1333MHz today, and I must say, I'm able to run multiple applications without any hassle 🙂 The problem I see is, or rather tech-OCD, is that according to Geekbench and Xbench, my score 'dropped' or stayed the same. For Geekbench, it gave me the exact same score or lower, and it was the same for Xbench too. I know that the scores does not really matter in real world situation, but why is it? Is it because I haven't used much of it?