It's slow, but bearable, and unlike your EPIA 5000 it's i686.
Yeah, the CPU is the reason I want to switch to a Jetway or Intel Atom board. The 5000 suffices for what it currently does, but _everything_ is CPU-bound. Now that I'm thinking of also running Asterisk on my home-server, it's really becoming a problem.
Still, if low power-usage is your overriding consideration, and you can live with some limitations on what you can run, the EPIA 5000 is a winner.
While this is the first "hard" X-Ray laser, there have been lasers producing (softer) x-rays far longer.
When I was in college studying physics, we went on a field-trip to the FOM institute near Utrecht, the Netherlands. Even back then, they had a FEL operational that they told could produce coherent light in a large range of wavelengths. If I remember correctly, this range extended into the soft x-ray range.
The first office of my startup was in a shed in the back yard of a house owned by a former hippie in Berkeley, CA. It got extremely hot in there, but what made it worth mentioning here was that the land-lady was a little wacky.
At one point, we heard horrible screams coming from the house. Upon rushing in, we found the land-lady completely unharmed but with a self-help "screaming therapy" manual.
Later, a wasp-nest appeared under the roof of the patio, which we had to pass to reach the bathroom. When we asked the land-lady to remove it, she told us she couldn't until she had consulted her "healer", who was on vacation and wouldn't be back for another two weeks. The healer eventually advised the use of fly-paper.
Anyone can make an omelet with eggs. The trick is to make one with none.