Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black Gaming video card vs MSI GeForce RTX 2080 Ti Lightning Z video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black Gaming runs at 2.150 GHz+ 18 % base clock speed and has 16 GB of GDDR6 memory, while video card MSI GeForce RTX 2080 Ti Lightning Z runs at 1.350 GHz base clock speed and has 11 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 350 W+ 40 %. Compare the table of benchmark results to find out which graphic card is better.