Comparison of XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming video card vs MSI GeForce GTX 1660 SUPER AERO ITX V1 video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card MSI GeForce GTX 1660 SUPER AERO ITX V1 runs at 1.530 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 125 W. Compare the table of benchmark results to find out which graphic card is better.