I'm checking my 1.4 Athlon in a FIC AD11 m/b. Stock hsf on the CPU, and a single front bottom mounted case fan, both running at about 4700rpm. Starts off about 36c, it's been less than 5 minutes now and it's already up to 45c.
Edit: Seems to have topped out at about 55c with no load. This is at least 10 degrees cooler than the 1.2 it replaced. But the retail hsf was a better one than came with the 1.2 as well, so I don't know how much of a difference that makes.