Comparison of Sapphire Nitro+ Radeon RX 6800 XT video card vs Gainward GeForce RTX 3070 Phantom video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX 6800 XT runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card Gainward GeForce RTX 3070 Phantom runs at 1.500 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 250 W+ 14 %. Compare the table of benchmark results to find out which graphic card is better.