A ver, os contare como yo lo hago:
-OC Muy moderado <= 4Ghz -> Cooler Master Hyper TX3 EVO, Arctic Cooling Freezer 13, etc
-OC Normal <= 4.2~4.5 Ghz -> Cooler Master Hyper 412S, Scythe Mugen 3, Scythe Ninja 3 Rev.B // Antec Kuhler H2O, Corsair Cooling Hydro Series H80
-OC Grande <=4.6~4.8gHZ -> Phanteks TC14, Thermalright Silver Arrow, Noctua NH-D14 // Corsair Cooling Hydro Series H100
Mayor de eso, Kits de RL de EK o RLs por piezas.