The 2012's had the second generation CPUs of that class, and they ran cooler than those used in 2011. A lot of people had major heat issues with the 2011, it's

The 2012's had the second generation CPUs of that class, and they ran cooler than those used in 2011. A lot of people had major heat issues with the 2011, it's quite famous. Apple was basically in denial about the issue until last year when they issued the repair order. Having said that, most of the quad core models will get hot pretty fast, especially if you use something like Chrome. If you use Safari, you probably won't have those issues, as it's much more efficient than Chrome, but that's a preference thing.