Comparison of GIGABYTE Radeon RX 6900 XT Gaming OC 16G video card vs AMD Radeon RX 6600M (Mobile) - 100 W video card by specifications and benchmarks. GIGABYTE Radeon RX 6900 XT Gaming OC 16G runs at 1.875 GHz+ 3 % base clock speed and has 16 GB of GDDR6 memory, while video card AMD Radeon RX 6600M (Mobile) - 100 W runs at 2.068 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 340 W+ 13 %, and the second is 100 W. Compare the table of benchmark results to find out which graphic card is better.