Comparison of PowerColor Liquid Devil Radeon RX 6900 XT Ultimate video card vs GALAX GeForce RTX 2080 Ti SG (1-Click OC) V2 video card by specifications and benchmarks. PowerColor Liquid Devil Radeon RX 6900 XT Ultimate runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card GALAX GeForce RTX 2080 Ti SG (1-Click OC) V2 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.