Comparison of ASUS Dual Radeon RX 6600 video card vs AMD Radeon RX 6900 XT video card by specifications and benchmarks. ASUS Dual Radeon RX 6600 runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card AMD Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 132 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.