Comparison of PowerColor Red Devil Radeon RX 6900 XT Limited Edition video card vs ZOTAC GAMING GeForce RTX 2080 Blower video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 6900 XT Limited Edition runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card ZOTAC GAMING GeForce RTX 2080 Blower runs at 1.515 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 215 W. Compare the table of benchmark results to find out which graphic card is better.