I does make a difference
Are you going all groovy new age rap on us Richard or is that your corporate slogan?
91c, mmm...just perfect for cooking bacon on - a few years ago your CPU would have fried hence the automatic shutdown/switch-off.
I took the bold move of switching off the fan on my cpu the other day. Didn't make any difference to the temperature. At least my PC's quieter.
amowf
ps. I have a zalman flower heatsink on it...in case you were wondering...