Comparison of PowerColor Radeon RX 6900 XT video card vs GIGABYTE GeForce RTX 2080 Ti Windforce 11G video card by specifications and benchmarks. PowerColor Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card GIGABYTE GeForce RTX 2080 Ti Windforce 11G runs at 1.350 GHz base clock speed and has 11 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.