Oh I meant TWO 670's
25% loss of heat on either, all towards quietness but yeah prolly fine. I'm sticking with my 580 till the refresh like you.
GPU blocks - makes little difference
IMHO - as long as their full cover blocks (VRMs as well etc) then they're much of a muchness. The drops in temps are huge anyway over air blocks.
Pumps - never had a pump fail on foam or on the 'gel stuff' sounds like nonsense - the pump will be cooled by the water anyway! What could be simpler?
Beats messing with knicker elastic fraz!!!
Water wetter - dubious about the claims myself but it's very cheap for the volume of water it'll treat and because it's developed for car systems doesn't have corrosive effects. Simple, effective.
file server - N40L is mine - sit's in a cupboard, inaudible
Bit short but theres a cold one waiting for me