Comparison of GIGABYTE Radeon RX 580 Gaming 8G MI video card vs PowerColor Radeon RX Vega 56 Nano Edition video card by specifications and benchmarks. GIGABYTE Radeon RX 580 Gaming 8G MI runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card PowerColor Radeon RX Vega 56 Nano Edition runs at 1.156 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 210 W. Compare the table of benchmark results to find out which graphic card is better.