Right now, most computer users grab the cheapest motherboard that will work for them, and one of the places they spend extra cash is splurging on more CPU than they need. Now, motherboard makers will be able to pair the faster-stepping CPUs with 'markup' motherboards and capture a lot of that windfall to themselves, no? Doesn't this price-insensitive enthusiast market send a lot of cash Intel's way?
Maybe Intel is worried about the health of x64 white box component makers and is intentionally sending them a windfall?