Comparison of SAPPHIRE Radeon RX 7900 XT 20GB video card vs SAPPHIRE Radeon RX 7900 XT 20GB video card by specifications and benchmarks. SAPPHIRE Radeon RX 7900 XT 20GB runs at 1.500 GHz base clock speed and has 20 GB of GDDR6 memory, while video card SAPPHIRE Radeon RX 7900 XT 20GB runs at 1.500 GHz base clock speed and has 20 GB of GDDR6 memory. The TDP of the first video card is 308 W+ 3 %, and the second is 308 W+ 3 %. Compare the table of benchmark results to find out which graphic card is better.