Comparison of Sapphire Radeon RX 6800 video card vs AMD Radeon RX 7800 XT video card by specs and benchmarks. Sapphire Radeon RX 6800 runs at 1.800 GHz+ 6 % base clock speed and has 16 GB of GDDR6 memory, while video card AMD Radeon RX 7800 XT runs at 1.800 GHz+ 6 % base clock speed and has 16 GB of GDDR6 memory. The weight is different, -- vs --. The TDP of the first video card is 250 W, and the second is 250 W . Compare the benchmark results to find out which video card is better.