Comparison of XFX Radeon RX 580 GTS Black Edition 8GB only a Best Buy video card vs Gigabyte GeForce RTX 2060 Windforce OC 12G video card by specs and benchmarks. XFX Radeon RX 580 GTS Black Edition 8GB only a Best Buy runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card Gigabyte GeForce RTX 2060 Windforce OC 12G runs at 1.257 GHz base clock speed and has 12 GB of GDDR6 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.