SAPPHIRE NITRO Radeon™ R9 390X 8G D5 with Back Plate. Dual ball bearings on the fan spindles ensure smooth running and long life and are designed to keep out dust. A quiet cooling solution, Two ball-bearing fan features a high-efficiency blade design. 10mm diameter copper heat pipe has 53% better efficiency at dissipating heat than 8mm heat-pipe. Single 10mm diameter heat pipe is capable to handle 90W thermal dissipating. (8mm diameter is designed for TDP 65W). With 1x10mm, 2x8mm and 2x6mm heat pipe, the module is designed to handle over 300W GPU Power.