cost? probably
heat and weight? not really
Did you look at the specs in the product brief?
You need 2 chips, the slowest part (1 core @ 615MHz) with the I/O hub is rated at 10.4 W. There are quad-core ARMs at 1.4GHz+ in shipping devices at well under 1/2 of that.
Remember, we're talking about compact devices (tablets, PDAs, phones) with X86 compatibility and DX11 graphics.
How much x86 software is there for tablets?
There's a reason MS did Metro. Tablets need a completely different interface.
None of you x86 software is written for this interface.
If you want x86 and DX11 in a tablet I think you'll be stuck with Intel for some time yet. Though you will be getting DX11 from mobile GPUs soon.
