Comparison of Sapphire Radeon RX 6800 video card vs Gainward GeForce RTX 2070 Phoenix GS (DVI) video card by specifications and benchmarks. Sapphire Radeon RX 6800 runs at 1.800 GHz+ 6 % base clock speed and has 16 GB of GDDR6 memory, while video card Gainward GeForce RTX 2070 Phoenix GS (DVI) runs at 1.410 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 250 W, and the second is 185 W+ 6 %. Compare the table of benchmark results to find out which graphic card is better.