Hey, I now realise that I'm gonna have to upgrade my RAM to get the best performance when using Photoshop. So I've been looking around and I've found this on Crucial. It won't let me link you, sorry. And my MacBook Pro is from November 2011, so; So, would that RAM work? Also, would I need to buy it as 2x4GB modules? Or could I just buy one and use it with one of my current 2GB ones? Thanks.