Comparison of Sapphire Nitro+ Radeon RX 5700 XT 8G SE video card vs XFX Radeon RX 6900 XT video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX 5700 XT 8G SE runs at 1.840 GHz+ 15 % base clock speed and has 8 GB of GDDR6 memory, while video card XFX Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 285 W+ 27 %, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.