Comparison of Gainward GeForce RTX 2080 Phantom GS video card vs ASRock Radeon RX 6500 XT Challenger ITX 4GB video card by specifications and benchmarks. Gainward GeForce RTX 2080 Phantom GS runs at 1.515 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6500 XT Challenger ITX 4GB runs at 2.200 GHz base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 215 W, and the second is 107 W. Compare the table of benchmark results to find out which graphic card is better.