Comparison of MSI Radeon RX 580 Gaming X+ 8G video card vs XFX Speedster MERC 319 Radeon RX 6700 XT Black Gaming video card by specifications and benchmarks. MSI Radeon RX 580 Gaming X+ 8G runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card XFX Speedster MERC 319 Radeon RX 6700 XT Black Gaming runs at 2.457 GHz+ 6 % base clock speed and has 12 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 211 W-8 %. Compare the table of benchmark results to find out which graphic card is better.