Is 4GB ram enough for the new 13" rMBP? I have ordered the 13" rMBP 2012 base model with 8GB ram, but now I think I should probably go for the base 2013. The reason why I went with the 2012 was the 4GB extra ram and it fit better in my budget, but now I think the new processor and graphics would give me better performance even with 4GB less ram. Is this correct? I will mostly be using it for web browsing with multiple tabs, watching hd movies and listening to music in iTunes. What do you guys think?