The GPU block we are looking at today is from Aqua Computer's aquagraFX series of water blocks. It is a full cover block that is CNC milled from a solid block of copper. The top and backing plates are made from stainless steel. This not only looks nice, but steel is lighter than copper and the inlet ports are also made from Delrin plastic, which is even lighter yet. Overall the aquagraFX water block weighs in at 850g; that is 350g lighter than the 1.2kg Danger Den full copper block we recently looked at. The lighter weight will mean less stress on the card and a lesser chance of snapping something that shouldn't, but can it keep the GF100 ' Fermi' core as cool?