it was always reliable in my other x48 chipset, and the temps i get in realtemp support what cpuz is telling me. i idle at 30-34 and load around 40.
have you been able to clock any higher than 3.2? because i was able to do that right out of the box, no volt changes. But my chip did 3.8 on my gigabyte x48 mobo. So...uh...yah.