Comparison of Sapphire Radeon RX 5700 XT 8G video card vs ASRock Radeon RX 6700 XT Challenger Pro 12GB OC video card by specifications and benchmarks. Sapphire Radeon RX 5700 XT 8G runs at 1.605 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6700 XT Challenger Pro 12GB OC runs at 2.375 GHz+ 2 % base clock speed and has 12 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 230 W. Compare the table of benchmark results to find out which graphic card is better.