Comparison of XFX Speedster MERC308 Radeon RX 6600 XT BLACK Gaming video card vs ZOTAC GeForce GTX 1070 OEM V2 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 ZOTAC GeForce GTX 1070 OEM V2 runs at 1.506 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 160 W, and the second is 150 W. Compare the table of benchmark results to find out which graphic card is better.