Comparison of PowerColor Liquid Devil Radeon RX 6900 XT Ultimate video card vs ZOTAC GAMING GeForce GTX 1660 6GB GDDR5 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 ZOTAC GAMING GeForce GTX 1660 6GB GDDR5 runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 300 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.