What is the difference between MacBook pro 2011 and 2012

What is the difference between MacBook pro 2011 and 2012

understanding that at the time of the question, there has not been any Macbook Pro 2012, now it is later and there is.
The difference is:
-CPU being used (2011 models: Sandy Bridge, 2012 models: Ivy Bridge)
-Graphics (2011: intel 3000 + on 15"/17" ATI, 2012: intel 4000 + on 5"/17" nvidia Geforce 650M)
-USB (2011: USB2.0 only, 2012: USB3.0)
-Bluetooth (2011. 2.1 + EDR, 2012: 4.0)
Ivy Bridge CPUs are smaller and are a little bit more energy-efficient.
Other than that, currently the devices are not much different in respect to performance (Apple's graphics driver performance is known to increase during upgrades, though, so the performance gap may widen up)

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