I can't read the minds of Apples engineers as I'm on the east coast. So take the comments below as reasonable stabs at the possibilities
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Originally Posted by
aiolos 
I hope the 8GB RAM option is true, but as far as the ULV processors, go, I still don't understand why everyone thinks Apple will use the ULV processors. Since the GPU in now bundled with the CPU, and the power usage of those combined chips is 17W, I don't understand why they need to use them as the current MBA's use a 17W CPU + separate 10W GPU. That's 27W.
I don't think anybody has ruled out that. The problem is Apple wants to improve the AIR in many ways. For example battery load is a significant issue on this platform. To put it plainly AIR needs to run for longer periods of time on a recharge. There are other things to consider also, such as that power becomes a point load that is very compressed relative to a Core @ Duo and a graphics chip someplace else.
Lastly people know little about the power footprint of the TB port. Don't laugh the chip could use 0.1 watts or 10 watts nobody knows.
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Therefore Apple should be able to use LV processors, which are 25W. Am I missing something here because I don't see why Apple needs to drop performance to the ULV processors when the LV processors are in the same thermal design arena as what the current models employ.
All Apple really needs to do is offer up a solid performance boost over previous models. How they get there is not really a concern.
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Maybe the ULV's processors can be used on the 11 inch, which has had complaints about the battery life, but the 13" is more than capable of handling the LV processors.
They could also handle AMD Fusion processors. The funny thing here is that in many work loads the Fusion line is actually a lower power chip. Beyond that Intel hardware can be thermal hogs, the numbers that Intel publishes are not the chips maximum power.
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Space? I was under the impression RAM modules were a given size, and the density of the RAM on it was the difference. Also, how does more RAM = more power usage? You either access the RAM or you don't.
In the case of dynamic memory you have more cells to refresh, thus more transistors to power. While power per bit has gone down over the years, you are still implying a doubling of RAM.
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Apply generally always provides a BTO RAM upgrade, so if they change the base amount to 4GB as this article implies, I would expect an 8GB option.
Now you are talking!