Comparison of GIGABYTE Radeon RX 6900 XT 16G video card vs Sapphire Radeon VII video card by specifications and benchmarks. GIGABYTE Radeon RX 6900 XT 16G runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card Sapphire Radeon VII runs at 1.400 GHz base clock speed and has 16 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.