SAPPHIRE NITRO Radeon™ R9 380 2G D5. 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. To ensure best stability SAPPHIRE special products utilize black diamond chokes. The choke is an important component of the power regulation on a graphics card and the SAPPHIRE black diamond choke with integral heatsink runs 10% cooler and with 25% more power efficiency than a normal choke. Intelligent fan control allows one or more fans to be stopped for lower noise when the card is under light load and automaticaly restarted when the card temperature rises.