While Intel says that it has nothing to fear from Arm chips, it seems that the One Laptop Top Per Child project might disagree. The OLPC group, which aims to bring cheap laptops to kids in developing countries has been experimenting with the RM Marvell Armada 610 chip.
OLPC CTO Edward J. McNierney showed Arm devices how the chip went faster than the Intel equivalent. The chip provides for a sub 2 Watt One Laptop Per Child XO Laptop with much more back for its buck.
Not only is power consumption halved to less than 2 Watts and price of the motherboard is reduced, the performance of the next generation OLPC Laptop is actually faster to run full Fedora Linux compared to x86. The price of the OLPC machine is getting close to the $100 per machine which was the charities original goal.