Comparison of ASRock Radeon RX 6600 Challenger ITX video card vs KFA2 GeForce RTX 2070 OC video card by specifications and benchmarks. ASRock Radeon RX 6600 Challenger ITX runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card KFA2 GeForce RTX 2070 OC runs at 1.410 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 132 W, and the second is 175 W. Compare the table of benchmark results to find out which graphic card is better.