^ 68 is hot, but not TOO TOO hot.. 80-95* is pushing it.. The NB on my last Asus board ran pretty hot.. The heatsink was almost too hot to touch. -SB too for that matter.
Replace the paste for the heatsinks and see if that helps.. But you may have to take the board out to get those xmas tree pins out of the heatsink. If it still runs hot, you can pick up a thermaltake universal chipset cooler.