Comparison of XFX Speedster MERC 319 Radeon RX 6800 XT Core Gaming video card vs ZOTAC GeForce GTX 1080 AMP Extreme video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6800 XT Core Gaming runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card ZOTAC GeForce GTX 1080 AMP Extreme runs at 1.771 GHz+ 10 % base clock speed and has 8 GB of GDDR5X memory. The TDP of the first video card is 300 W, and the second is 270 W+ 50 %. Compare the table of benchmark results to find out which graphic card is better.