AMD Radeon RX 580 Mobile 's Advantages
More VRAM (8GB vs 6GB)
768 additional rendering cores
NVIDIA GeForce GTX 1660 Ti Mobile 's Advantages
Released 2 years late
Boost Clock has increased by 48% (1590MHz vs 1077MHz)
Larger VRAM bandwidth (288.0GB/s vs 256.0GB/s)