ski, I have a 8100 as well, and use i8kfanGUi to bring fans on more often as well. I get it to run at 43-50, much like you. I would see 60C as not acceptable, though safe. I agree that lower temps are better - better temps should dramatically increase longevity of the machine. However, the fans on the 8100 are quite noisy, and found there is a low temp (around 44), which it quickly returns to after a second or two whatever the low temp set. Setting the temp too low just results in the fans running constantly, repeatedly returning the machine to the lowest level set with little sustainable improvement in system temp. I don't use i8kfanGUI at present on the M70. It runs most of time at around 50C, and has much quieter fans than the 8100. I am considering its use.