[Jacques]

Does the O2 have any form of sensor / fan speed adjustment run at hardware or software level? I turned my O2 on Saturday morning and found the fan spinning faster and faster the hotter the machine got? This was weird as it doesn't do this with the R5k (300Mhz) processor module installed, which obviously runs a lot cooler?

I do have a CoolerMaster 80mm fan (closest I could get to the required CFM and static pressure) in the PSU and it has a bit of a wobble when it runs at full speed, not so much at slightly slower speed. When the machine is running warm the fan wobble sound is quite pronounced (so much so I'll probably swap back the original fan).

But yes, just wondering about fan speed control? I know the Octane goes from 8v fans at normal vs. 12v on Speedfan=1, but never heard of anything on the O2.