If you have a good ventilated case( i mean with 3-4 12cm fans) you don't have any problems... Even if you don't have such a ventilated case, at stock volts, any GTX 460 doesn't warm anything. An doesn't limit any overclock on Cpu, let say 4ghz on an i5 750, or 4.4ghz on an i3. I suposed that if you have money for an i7 you have money for a good case too..
You just exagerate.