Comparison of PowerColor Red Devil Radeon RX 6900 XT video card vs MSI GeForce RTX 3070 Twin Fan 8G OC video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card MSI GeForce RTX 3070 Twin Fan 8G OC runs at 1.500 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 220 W. Compare the table of benchmark results to find out which graphic card is better.