Please see smiddlehurst's post.
Additionally, highlighted are the chips being used in the 15 and 17 inch MBPs.
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I'm not defending Apple. I'm explaining there choices. If I owned my own laptop ( I don't), it wouldn't be an apple.
Interesting post although as I'm sure you know TDP is a very inaccurate measure of power consumption. i5's are quoted as 35w as opposed to 25w for C2D. However many tests have clearly shown that the i3/i5 manage their power consumption far better than CD2's. If they can fit a 2.53ghz CD2 inside the 13" then I doubt an i5-540 would be a problem let alone an i3.
A P8700 consumes 31.7W's at peak in reality whilst an i5-540 hits around 32.5W. There's very little in this. The i5-540 is the model replacement effectively for the C2D 2.53ghz. It also boosts CPU performance by 11-40%.
I'm pretty sure the issue is one purely to do with the limitations placed by the enclosure design with regard to a dedicated GPU. Arrandale forces a more limited integrated graphics solution and given the limited space and increase in thermal footprint clearly a second dedicated GPU requires a considerable redesign. I have a bit of sympathy for Apple, strictly Intel playing hard ball with nVidia is the real cause.
It's a real shame and as much as we want to put a brave face on it, Apple today are selling a 'new' 13" MBP with an increased price (at least in the UK, £999 up from £849 a couple of months ago) with 4+ year old CPU design. Not great for a Pro machine however much we want to hype up the new graphics solution.
It's also the reason why the battery life and graphics are being highlighted although an i3/i5 with Intel HD/nVidia 330 dedicated sacrifices very little in battery life or thermal envelope and is a far superiour configuration particularly with Optimus.
It will be interesting to see where Apple go from here, luckily for them the MBP is a lovely design object as well as a great laptop and most consumers couldn't care less. CD2???? i5??? What are they again?
Sandybridge does seem an awfully long way away though, Jan 2011 at the moment so realistic supply and integration we could be looking at a 12 month wait?