Comparison of XFX Radeon RX 590 Fatboy 8GB video card vs KFA2 GeForce GTX 1660 Ti (1-Click OC) video card by specifications and benchmarks. XFX Radeon RX 590 Fatboy 8GB runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory, while video card KFA2 GeForce GTX 1660 Ti (1-Click OC) runs at 1.500 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.