Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming video card vs Gainward GeForce RTX 3080 Phantom+ LHR video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card Gainward GeForce RTX 3080 Phantom+ LHR runs at 1.440 GHz base clock speed and has 10 GB of GDDR6X memory. The TDP of the first video card is 300 W, and the second is 340 W+ 6 %. Compare the table of benchmark results to find out which graphic card is better.