Comparison of XFX Speedster MERC 319 Radeon RX 6800 Black Gaming video card vs EVGA GeForce GTX 1660 XC OC video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6800 Black Gaming runs at 1.850 GHz+ 9 % base clock speed and has 16 GB of GDDR6 memory, while video card EVGA GeForce GTX 1660 XC OC runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 250 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.