The ASUS ROG Ryujin is the larger of the pair, available in 240mm and 360mm varieties the AIO cooler will have a fan on the waterblock to provide cooling to the components around the socket while the Ryuo will drop the fan and slim the radiator to 120mm or 240mm.  Both models will have a 1.77" colour OLED screen bearing the name LiveDash, which can be programmed to display live data on CPU Frequency, voltage, temperature, and wide variety of other stats available to your motherboards sensors. 

Looks aside, can these new ASUS cooler prove effective?  Read on at Guru3D for the answers.

"Today, we are reviewing the new Asus ROG-series AIO liquid coolers, the Ryujin and Ryuo. ASUS ROG (Republic of Gamers) is a branding that represents the highest standard from Asus. Ryujin is a legendary Japanese dragon that symbolizes the power of the ocean."

Here are some more Cases & Cooling reviews from around the web:

CASES & COOLING