Comparison of GIGABYTE Radeon RX 580 Gaming 4G MI video card vs GIGABYTE Radeon RX Vega 64 Silver 8G video card by specifications and benchmarks. GIGABYTE Radeon RX 580 Gaming 4G MI runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory, while video card GIGABYTE Radeon RX Vega 64 Silver 8G runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 185 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.