We are regularly receiving questions and comments regarding radiators in our liquid cooled products: - why do we have only one radiator for five water blocks? or, - one radiator would not be enough for my 6x1080 water cooled rig We use a radiator similar to this http://hardwarelabs.com/nemesis/gtx/360gtx/ exclusively modified for our Comino N1. This radiator has a very thick finning and can conduct up to 1500w of heat. Which is more than enough in our case. Plus - solid performance tuned for low speed fans. In practice, it can also easily handle a 6x1080 (FullCover) with a Laing DDC 1TPllus pump. Some techs: 120 mm x 3 fan Xtreme form factor two-pass radiator 398mm x 133mm x 54mm (L x W x H) 16 FPI 25 Micron Copper Fins Now optimized for sub-800 rpm ultra-stealth fans Supercruise optimizations for scalable performance with higher speed fans 15% more tubing area in the same Black Ice® GTX™ 240 form factor Increased internal coolant flow rates Standard G 1/4″ inlet/outlet fittings Standard M4 mounting threads Compatible with Black Ice® Xtreme III, Black Ice® GTX™ 360 radiators Custom Dark Matter™ high quality finish Fully ROHS Compliant 100% Made from conflict-free materials Industry standard Black Ice® quality Lifetime warranty against manufacturing defects* It is a dual pass radiator, but not in the traditional sense, where the coolant flow path is side to side or U flow. Its flow path is front to back OR back to front depending on which port is used as the inlet. In other words the coolant travels up the tubes the full width of the radiator core then changes direction in the non-port tank and travels down the other set of tubes on the opposite side of the core. To get this flow path to work they have installed a plate and tube in the port tank ends. A professional product, though, not very common for a regular user, building rigs. Therefore, the price may be on the premium side, but it's not unreasonable for a radiator that is not outsorced in China.