Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black Gaming video card vs KFA2 GeForce RTX 3080 Ti SG (1-Click OC) 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 KFA2 GeForce RTX 3080 Ti SG (1-Click OC) runs at 1.365 GHz base clock speed and has 12 GB of GDDR6X memory. The TDP of the first video card is 300 W, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.