Comparison of ASUS ROG Poseidon GeForce GTX 980 video card vs Zotac GeForce GTX 980 OC video card by specs and benchmarks. ASUS ROG Poseidon GeForce GTX 980 runs at 1.127 GHz base clock speed and has 4 GB of GDDR5 memory, while video card Zotac GeForce GTX 980 OC runs at 1.127 GHz base clock speed and has 4 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 165 W, and the second is 165 W . Compare the benchmark results to find out which video card is better.