Comparison of PowerColor Radeon RX 5700 XT Red Dragon video card vs XFX Speedster MERC 319 Radeon RX 6900 XT Black Gaming V2 video card by specifications and benchmarks. PowerColor Radeon RX 5700 XT Red Dragon runs at 1.650 GHz+ 3 % base clock speed and has 8 GB of GDDR6 memory, while video card XFX Speedster MERC 319 Radeon RX 6900 XT Black Gaming V2 runs at 1.950 GHz+ 7 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.