Comparison of GIGABYTE Radeon RX 580 Gaming 8G MI video card vs GALAX GeForce RTX 3090 HOF 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 GALAX GeForce RTX 3090 HOF runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 185 W, and the second is 420 W+ 20 %. Compare the table of benchmark results to find out which graphic card is better.