I have the exact same mother board and CPU in my kids computer. I would say if it gets to 50c under a load you are hurting it. 45-49 I would be looking for better cooling with the goal of keeping it under 40. They have a dual fan Global Win cooler can't remember the model # and 1 intake and 2 exauhst fans it is also clocked to 450 Mhz and runs at about 35-38c under a load
What are these internal vs. external CPU temperatures you speak of? My ASUS PROBE software for my ASUS CUV4X only shows 1 CPU temperature... is this the temperature I should be going by? Is it showing the internal or external CPU temperature?
(I have a Celeron 566 at 100.2 FSB for 852MHz.)
Depends on the CPU completely! Ever CPU has it limits. Intel and AMD both publish the max temperatures the CPU could theoretically withstand, as well as recommend maximum operating temps for a particular model of CPU. Obviously AMD processors run hotter, and they had to engineer the fact that they were going to run hotter into the processor design, otherwise failure would occur very easily. Intel prides themselves on less current usage, and better thermal characterisitics, therefore most of their CPU's are not designed to handle the kind of heat AMD processers endure. This does not mean AMD processors are better because of the heat issue, but simply that Intel will not withstand the high temps. I would have to guess this is why AMD still uses a ceramic substrate to mount their cores into, and Intel uses a plastic epoxy. The ceramic will absorb some of the heat and assist in cooling, the plastic epoxy Intel uses is a very poor conductor and will force the CPU to retain most of its heat and transfer all of it to the heatsink, but since Intel processors displace less wattage, power, they run cooler. In the end, refer to manufacturers documentation for the real information on heat and power limits.