Comparison of Sapphire Nitro+ Radeon RX 5700 XT 8G SE video card vs XFX Speedster MERC 319 Radeon RX 6900 XT Black Gaming V2 video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX 5700 XT 8G SE runs at 1.840 GHz+ 15 % 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 285 W+ 27 %, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.