Comparison of Sapphire Radeon RX 5700 XT 8G video card vs ASUS Dual Radeon RX 580 OC 4G video card by specifications and benchmarks. Sapphire Radeon RX 5700 XT 8G runs at 1.605 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ASUS Dual Radeon RX 580 OC 4G runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory. The TDP of the first video card is 225 W, and the second is 185 W. Compare the table of benchmark results to find out which graphic card is better.