SAPPHIRE PULSE AMD Radeonâ„¢ RX 6600 The SAPPHIRE PULSE AMD Radeonâ„¢ RX 6600 Graphics Card runs on the powerful Dual-X Cooling Technology coupled with Intelligent Fan Control to keep temperatures low and fan noise low. The refined PCB design delivers stable, reliable, and steady performance, which efficiently lowers PCB temperature and component signal noise.