Intel has been mired in an anti-trust lawsuit in the EU for a decade now, on charges that they offer deep discounts to OEMs on the condition that they don't ship products from competitors (read: AMD) in volume. Such a program would put substantial pressure on OEMs to avoid AMD, since they'd still need to ship a large number of Intel-based products, and losing those discounts would mean their Intel-based products would end up substantially more expensive than their competitors'. The only way to get out of the trap would be to ship nothing but AMD-based products, and demand for Intel is still strong enough that doing so would essentially be committing suicide.

All of which would explain why you don't see many AMD-based products from OEMs on the shelves, despite AMD's clear superiority in the latest generation.