My old koolance CPU300-V06 6mm tubing water block is not doing well with my new E6600. It require a huge copper disk to transfer heat from the cpu to the water block which cause horrible performance. So I am in the market for a new water block. I don't want to buy the new koolance water block because it is so freaking expensive. I have the koolance pc2 case which uses 6mm tubes, not sure if that is going to limit my choices.