Sapphire is the first manufacturer to announce a modified Radeon HD 2900 XT compared to the original design. This TOXIC model features a water-cooling heat device, announced logically as being more efficient than the original one.
This system using a box requiring two 5"1/4 bays and a 120mm fan is in fact the Thermaltake Bigwater 760i. Sapphire indicates that it can cool down a second TOXIC card if there is a CrossFire configuration but also the CPU. We noted though that at CeBIT Thermaltake said that to cool down the CPU, it was imperative to add a second radiator.
It is important to point out that this water-cooling system isn't the most efficient. The fact that the heat dissipated isn't directly extracted from the tower is problematic. Sapphire announced that the core clock could be improved by at least 15% compared to the 750 MHz du HD 2900 XT. The TOXIC version will be available in a couple of weeks at an unknown price.