Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming video card vs MSI Radeon RX Vega 64 Air Boost 8G OC 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 MSI Radeon RX Vega 64 Air Boost 8G OC runs at 1.272 GHz+ 2 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.