Comparison of ASUS Dual Radeon RX 580 OC 4G video card vs EVGA GeForce GTX 1660 XC ULTRA GAMING video card by specifications and benchmarks. ASUS Dual Radeon RX 580 OC 4G runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory, while video card EVGA GeForce GTX 1660 XC ULTRA GAMING runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 185 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.