High performance low restriction Water block EK-NB EVGA 680i was made just for EVGA 680i Northbridge motherboard. It has small water restriction, and it has better performance any Northbridge needs.
For SB chipset of EVGA 680i please use EK-NF4 rev1.1 block.
Water clocks base is made of electrolytic coper, and top is made of quality Acrylic plexi glass. Base is extremely flat and polished to mirror finnish.