Comparison of ASRock Radeon RX 6700 XT 12GB video card vs Sapphire Toxic Radeon RX 6900 XT Extreme Edition video card by specifications and benchmarks. ASRock Radeon RX 6700 XT 12GB runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card Sapphire Toxic Radeon RX 6900 XT Extreme Edition runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 230 W, and the second is 430 W+ 43 %. Compare the table of benchmark results to find out which graphic card is better.