Comparison of XFX Speedster MERC 319 Radeon RX 6800 XT Black Gaming video card vs ZOTAC GeForce GTX 1080 Ti Blower video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6800 XT Black Gaming runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card ZOTAC GeForce GTX 1080 Ti Blower runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory. The TDP of the first video card is 300 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.