> Thanks for the pointers on TDP ratings. It's very helpful to see that a new
> X201 may (for example) have a core i7 @ 2.66GHz with max TDP of 35W --
> whereas my X61s has a core duo @ 1.8 GHz with max TDP of 17W.
Note that the i7 includes the GPU in the chip, so the 35W should not
just be compared to the 17W of the Core Duo but of the combination of
the Core Duo and the accompanying GPU.
> Is it correct to think that "performance per watt" isn't going down
> very much?
Yes, it's going down very slowly.
> Also, is it correct think that if I run a core i7 at 75% CPU, will it
> generate about 75% as much heat?
No, not necessarily. It can save you a lot more than 25% of power
(because it can not only reduce frequency but also voltage, for
example). But it may also save you less since the chip includes more
than just the processor and the rest may keep running at the same speed.
IOW "it depends".
Stefan
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