The NB and SB temps were running close to 50c at idle without OCing. I did some research and two things helped the issue. Even with active CPU cooling I installed the Asus provided heatsink fan, but what really did the trick was installing an Antec spot cooling fan, adjusted to high and pointing directly at the heatsinks/pipes. The NB and SB temps are now in the low 40s and CPU (e8400) idles at 36. HTH anyone with a similar problem. john