Comparison of ASRock Radeon RX 6600 Challenger ITX video card vs Colorful GeForce GTX 1660 Ti SI 6G-V video card by specifications and benchmarks. ASRock Radeon RX 6600 Challenger ITX runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card Colorful GeForce GTX 1660 Ti SI 6G-V runs at 1.500 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 132 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.