For several years I ran a Sonnet G3 400MHz upgrade in a UMAX tower from which I had removed the original three(!) fans - and had modified the tower for convection-only cooling. I enquired of Sonnet who told me that the top working temperature for the chip was 80 (I assumed, rather than was told, Celcius) I used a free piece of software, that came with the upgrade, to monitor the temperature which never got above 46 as I remember.(I have forgotten the name of the software, but I remember the icon being a silhouette of a black cat). How relevant that tea-time story is to running a G4 at 1.4GHz in a Cube - I have been puzzling over for more than a year now! David On 20 Mar 2004, at 23:36, Snow White wrote: > I measure my temp in Celsius and I can tell you anything above 50 C is > too hot. Basically if you can smell the heat then you are around 50 > or more and it's too much (as far as I am concerned). Now Apple may > have some numbers or maybe XLR8yourmac.com or CubeOwner.com .