Comparison of ASRock Radeon RX 6600 Challenger ITX video card vs MSI GeForce GTX 1080 Ti LIGHTNING 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 MSI GeForce GTX 1080 Ti LIGHTNING runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory. The TDP of the first video card is 132 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.