I guess I'm wondering if I should be worried about the 68C or not? I was going to try to reseat the stock heatsync that I actually applied my own arctic silver to to get more contact area on the heat spreader than the stock dollop, but it sounds like this may be the normal operating range. I didn't notice this before handbrake, but I have found alt tabbing out of games the same warning is up in the background. I believe I can modify the warning temperature and was wondering if setting it to 70C should be fine. It is getting kind of old getting a warning every time I max the chip out in game or handbrake just because it had to turn the fan to 100%.
I was waiting to install my old Zalaman CNPS9700 cooler until I got a replacement board from the Intel SATA issue so I only have to take the board out the once, but might do it early anyway.
Any thoughts for me or other testimonies from other Sandybridge users?
I can't tell you anything about the apparent overclocking you've got going (my 2600K only hits 3.5GHz under load without any overclock settings), but as for your temperatures: Is that 68C reading from the AI Suite? That's what AI Suite shows on my 2600K with stock cooler when running Prime95 (once again, maxed at 3.5GHz). But I should tell you, most people say CoreTemp or RealTemp is the way to measure such things, and there I get in the upper 70s.
Like you, I'm waiting for my replacement board to install a better cooler. I'll be trying some overclocking for the first time then, I think.