Originally posted by punica888
Why should it cause heat problems? They will use the Pentium M, the best mobile computing chip available on the planet.
cool, high performance per watt.
Highly energy efficient.
I think there is a big misconception about the Pentium M. People think it is a cool processor. It is energy efficient, yes, but not cool. Let me explain what I mean.
If the P-M processor runs at its nominal speed, say 1.6 GHz, then it produces much more heat than a G4 at the same clock speed. So, how the P-Ms manage to stay cool? Quite simple: if almost nothing runs in the system (CPU usage below 5%), then the 1.6 GHz processor will scale down almost continuously to 36 MHz!! That's how. And you understand what this means for battery life. P-M laptops have great battery life not because the CPU uses less power when fully used, but because the CPU can drop its clock speed dynamically to very low levels under light or no use (e.g. when just reading some document). I saw this on my wife's Dell with special monitoring software and it is quite spectacular.
As I said, despite this wonderful technology of scaling dymamically the clock frequency accoding to the system load, I find the P-M processor rather hot. Less hot of course than a P4 (I don't know how it compares to the G5, I would say less hot too), but definitely more hot than an equally clocked G4.
Let me tell you this, taking as example the Dell of my wife: I cannot keep this computer on my lap to watch a DVD. Because after 15 min it starts to burn. And this is with 30-35% CPU usage. Keep in mind that this laptop is a thick one (4 cm or 1.6", comparable to the 17" iMac thickness) and it is plastic. All this make me think that today's high clocked P-Ms are completely inappropriate for the slim and metal Powerbook enclosure. And whatever improvements Intel is able to do, I seriously doubt that the Intel Powerbook will be metal. It's going to burn you if so.
For all of you hoping for high performance and cool Powerbooks after the switch to Intel processors, keep in mind that high performance (and the P-M is a high performance CPU) comes at a price: HEAT. The energy consumption efficiency of the P-M is for the moment the only measure to alleviate this problem and only when the system is not stressed.
PS: alright, who will fix now the images that screwed the page layout in this discussion?