Had this block for about a year now. Works great and keeps my BFG 285 (v1) card in the 55 and below range under full excruciating load. At idle it is low 40 to high 30 in a 25c room. It is on the same loop as an i7 920 so I use a GTX 480 rad and 4 x hi-rev Scythe Slipstreams - OCing is no problem and the thermals remain astonishingly nearly the same. DD loop is all copper, with FB fittings and Feser1 Red UV. Was part of my first liquid system - DD for life.