My results with the Intel I7 3770K and the Antec H20 620 closed water cooling.
On default maximum speed of 3.9 GHz, all cores running at 100% in hot weather, the temperature doesn't rise higher than 65°C.
Overclocked to 4.4 GHZ, it runs smooth and stable, with 100% power in hot weather, the temperature doesn't rise higher than 70°C.
Mainboard S-1155 ASUS P8Z68-V/Gen3, ATX
On default maximum speed of 3.9 GHz, all cores running at 100% in hot weather, the temperature doesn't rise higher than 65°C.
Overclocked to 4.4 GHZ, it runs smooth and stable, with 100% power in hot weather, the temperature doesn't rise higher than 70°C.
Mainboard S-1155 ASUS P8Z68-V/Gen3, ATX