The SAPPHIRE PULSE AMD Radeon™ RX 6400 Graphics Card runs on the cool and efficient Axial Fan coupled with Fuse Protection built into the circuit of the external PCI-E power connector to keep the components safe. Dual Ball bearing fans ensure a quieter operation and longer lifespan to increase product longevity. Boost Clock: Up to 2321MHz Memory: 4GB/64 bit DDR6. 16 Gbps Effective Stream Processors: 768 RDNA™ 2 Architecture Ray Accelerator: 12