Comparison of ASRock Radeon RX 6700 XT Challenger D 12GB OC video card vs Gainward GeForce RTX 2080 Phantom video card by specifications and benchmarks. ASRock Radeon RX 6700 XT Challenger D 12GB OC runs at 2.330 GHz base clock speed and has 12 GB of GDDR6 memory, while video card Gainward GeForce RTX 2080 Phantom runs at 1.515 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 230 W, and the second is 215 W. Compare the table of benchmark results to find out which graphic card is better.