Comparison of PowerColor Liquid Devil Radeon RX 6900 XT video card vs MSI Radeon RX 6600 ARMOR 8G V1 video card by specifications and benchmarks. PowerColor Liquid Devil Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card MSI Radeon RX 6600 ARMOR 8G V1 runs at 1.626 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 132 W. Compare the table of benchmark results to find out which graphic card is better.