Comparison of XFX Radeon RX 580 Double Dissipation 8GB video card vs Palit GeForce GTX 1660 Ti Dual video card by specifications and benchmarks. XFX Radeon RX 580 Double Dissipation 8GB runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card Palit GeForce GTX 1660 Ti Dual runs at 1.500 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.