Okay this might be a little bit restrictive, but for the GPU it works very well. In a test this block for the GTX 280 beats the EK-Block by 4,1°C better cooling. The flow with the EK-block was 292,2 litres per hour and the flow with the Watercool block was 253,2 litres per hour.

(1 Litre = 0,264172052 Gallons)