Ok I just bought mine yesterday at the apple store, I got the 15" basic model but I'm worried that this could be downgrade from the previous basic 15" model which a 2.4 and this one I got only has a 2.0, do you guys think that it is a downgrade?
No. 2.0 is faster than the 2.4GHz. Clock speeds mean nothing. The only thing that is a slight downgrade is the GPU. But if you don't do any video editing or play games at the high setting, you shouldn't notice a difference.
EDIT: for proof that the 2.0 is faster than both the 2.3 and 2.4 Ivy bridge:
http://www.primatelabs.com/images/blog/2013/retina-15-mc-performance.png
Again, clock speeds don't mean anything. Haswell processors run more efficiently than Ivy bridge at lower clock speeds.
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