Comparison of XFX Radeon RX 590 Fatboy 8GB video card vs ZOTAC GAMING GeForce GTX 1660 Ti 6GB GDDR6 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 ZOTAC GAMING GeForce GTX 1660 Ti 6GB GDDR6 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.