High performance low restriction Water block EK-NB EVGA 780i was made just for EVGA 670i Northbridge motherboard. It has low water restriction, and it has better performance any Northbridge needs. Water clocks base is made of electrolytic coper, and top is made of quality POM Acetal. Base is milled and is not pollished. The fitting barbs and fitting mechanism are included in price. Click here for installation manuals. Click HERE for compatibility list of NB/SB and Mosfet water blocks.