Comparison of PowerColor Red Devil Radeon RX 6800 XT video card vs MSI Radeon RX Vega 64 Iron 8G video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 6800 XT runs at 1.900 GHz+ 4 % base clock speed and has 16 GB of GDDR6 memory, while video card MSI Radeon RX Vega 64 Iron 8G runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.