Comparison of XFX Speedster MERC308 Radeon RX 6600 XT BLACK Gaming video card vs ASUS AREZ Strix Radeon RX Vega 56 OC Gaming video card by specifications and benchmarks. 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, while video card ASUS AREZ Strix Radeon RX Vega 56 OC Gaming runs at 1.297 GHz+ 12 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 160 W, and the second is 300 W+ 43 %. Compare the table of benchmark results to find out which graphic card is better.