Comparison of ZOTAC GeForce GTX 980 Ti AMP! Extreme video card vs Sapphire Radeon RX 6800 video card by specs and benchmarks. ZOTAC GeForce GTX 980 Ti AMP! Extreme runs at 1.253 GHz+ 25 % base clock speed and has 6 GB of GDDR5 memory, while video card Sapphire Radeon RX 6800 runs at 1.253 GHz+ 25 % 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.