Big, bigger, SuperNova! 400 x 400 x 45 mm of pure cooling surface for nine 140 mm or four 200 mm fans. No other Alphacool radiator offers such a large cooling area in one piece. Uncompromising in material choice, Alphacool also relies on pure copper for the NexXxoS 1260 SuperNova radiator. The chambers, water channels, and cooling fins are made of copper, making it a unique feature worldwide. As a result, Alphacool radiators have been among the most popular and best on the market for many years, providing the perfect foundation for any water cooling system. Impressive cooling performance: To maximize the performance of a radiator, Alphacool pulls out all the stops. It starts with copper. With a thermal conductivity of 400 W/(mK) for copper compared to 236 W/(mK) for aluminum, the winner is clear. Additionally, there is the special fin density. Alphacool is one of the oldest companies in the water cooling sector and has conducted countless lab tests. The result.