Comparison of XFX Radeon RX Vega 56 video card vs MSI Radeon RX 6500 XT MECH 2X 4G video card by specifications and benchmarks. XFX Radeon RX Vega 56 runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card MSI Radeon RX 6500 XT MECH 2X 4G runs at 2.200 GHz base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 210 W, and the second is 107 W. Compare the table of benchmark results to find out which graphic card is better.