Comparison of XFX Radeon RX Vega 64 Black Fan video card vs Gainward GeForce GTX 1660 SUPER Pegasus video card by specifications and benchmarks. XFX Radeon RX Vega 64 Black Fan runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory, while video card Gainward GeForce GTX 1660 SUPER Pegasus runs at 1.530 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 295 W, and the second is 125 W. Compare the table of benchmark results to find out which graphic card is better.