The 13" also has a better Integrated GPU (Intel HD4000 vs. Intel HD3000 in the 15") but, the Integrated GPU is all it has. So if you need to do video editing or other graphic intensive tasks, the 15" is leagues better in that regard.
If your looking for day to day tasks, the newer model might have a leg up being that it takes 1600mhz ram where as the 2011 will under clock the ram to 1333mhz.
I thought that it can accept 1600mhz of ram?
Also i also saw on the graphics specs of my mac that it has a 1gb amd radeon gpu (i think a ddr5 too if im correct). Is this going to be active only when the mac thinks it needs to? Thats why for day to day tasks the hd3000 is the main gpu?
Lastly, does the hd4000 better than the dedicated 1gb amd radeon on my macbook pro?
And no, not even close. Dedicated GPU is much more capable.
Thanks for you reply.
Anyway, what do I need to look at besides the speed of 1600mhz on Ram's?
I asked because here in the UAE there's a kingston 1600mhz 8gb already and here on the forum mostly they are using the corsair or the one from OWC. Is there a difference between the corsair w/c if, I will buy, it will be online w/o warranty and the Kingston w/c is already available here?
Oops I misread your post. Not sure if your Mac will support 1600mhz RAM. Check your specifications for your model.
1600mhz vs 1333mhz RAM will not make a noticeable performance difference. The quantity of RAM will. Buy whatever is the fastest speed your computer supports.