Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black Gaming video card vs ZOTAC GeForce GTX 1070 AMP Extreme Core video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black Gaming runs at 2.150 GHz+ 18 % base clock speed and has 16 GB of GDDR6 memory, while video card ZOTAC GeForce GTX 1070 AMP Extreme Core runs at 1.607 GHz+ 7 % base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 300 W, and the second is 250 W+ 67 %. Compare the table of benchmark results to find out which graphic card is better.