This cooler combines liquid and air cooling and according to CM it should offer silent 19dBA operation.
The product has a blue LED fan that spins at 1800RPM to generate an airflow of 14CFM and just like the stock cooler the Hydra 8800 exhausts the hot air out your case.
The Hydra 8800 features a pure copper base with three heatpipes and offers cooling for the GPU, memory and MOSFETs. Performance figures from Cooler Master indicate the Hydra 8800 performs up to 23.3°C better in load conditions than the stock GeForce 8800 Ultra cooler: