I built a box for my dad in December using this board and a 1.8 Willy. It's been running rock-stable (well, why shouldn't it?) since then. It's in an Antec SX635 case. The cooling is the retail HSF and the one stock Antec fan exhausting at the rear of the case (and the 2 fans on the PSU). CPU temps run 25-30 at idle, 32-38 at Prime95 load. This looks like a 24/7 kind of system to me.