Comparison of ASUS Dual Radeon RX 580 8G video card vs ASUS Dual Radeon RX 580 4G video card by specs and benchmarks. ASUS Dual Radeon RX 580 8G runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card ASUS Dual Radeon RX 580 4G runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 185 W, and the second is 185 W . Compare the benchmark results to find out which video card is better.