Comparison of SAPPHIRE Radeon RX 6700 XT video card vs ASRock Radeon RX 6900 XT OC Formula 16GB video card by specifications and benchmarks. SAPPHIRE Radeon RX 6700 XT runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card ASRock Radeon RX 6900 XT OC Formula 16GB runs at 2.125 GHz+ 16 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 230 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.