Even if horizontally I would still not feel comfortable with the heat, I myself would probably point a fan or two at it, especially if they were running CPU intensive stuff
And no kidding, that Octocore is crazy expensive.

The only way to match up these little processors to a full blown x86 processor has got to be to put several of them in a cluster, but then I wonder what is the wattage to cobblestones ratio. Or in other words, if we had a little cluster that was capable of putting out the same performance of a regular x86 chip, would it be more power efficient than said x86 chip?