AlphaCool NexXxoS NVXP-3 6800/7800 GPU block
 

Quote: The section of the block that sits over the core is griddled to aid the water to pick up the heat better, this has two side inputs and a outlet, this ensures that water is always over most of the GPU area then gets drawn to the middle outlet.

Link: http://www.xtremecomputing.co.uk/review.php?id=224