Comparison of GIGABYTE AORUS Radeon RX 580 XTR 8G video card vs XFX Speedster MERC308 Radeon RX 6600 XT BLACK Gaming video card by specifications and benchmarks. GIGABYTE AORUS Radeon RX 580 XTR 8G runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card XFX Speedster MERC308 Radeon RX 6600 XT BLACK Gaming runs at 2.188 GHz+ 11 % base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.