I ran a test with NB at stock speed and volts - only upped the 940 BE multi to 17.5. NB according to SmartGuardian was 66c and CPU was 49c.

I really want to watercool my NB (I have the PWM/NB heatpipe which can take a WB on NB in place of passive cooler) but cannot find one that fits, so I have the Akasa AK-210 40cm fan HS which I will try.