Howdy! Thought I'd chime in

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Dedicated boxes indeed usually boot faster. How much faster, though? I've successfully set up a Windows XP Embedded system, booting off a $10 flash drive (using the enhanced write filter), power-on to passing audio = under 40 seconds.
The claim that dedicated boxes tend to have more horsepower is patently false. A Core 2 Quad CPU can be had for $170 and packs an *insane* amount of power for audio processing (provided you know how to write good code.) In fact, I currently don't know what to do with that much power. BBP uses just 11% on a Q6600 Quad Core CPU in full mode, and it's a *very* complex algorithm.
It
did use to be true that computers were too slow for audio processing, and DSPs were the only route, but it's been a long time now. Pentium 4 changed all that.
Setting up two dedicated BBP systems with some kind of auto failover, provided you don't go nuts on the sound card, should still be significantly less expensive than even a Mini or a One. You don't need a quad core to run it -- the lowest of the low end single core Celerons currently available for desktops (Celeron 430) is enough. A celeron 430 is $39.99. For ten measly bucks extra you get a dual core 2 GHz celeron (E1400), which doesn't even break a sweat running BBP (35% load or so).
Sgeirk has a good point too. You can get a computer repaired *anywhere*. You can buy a new box *anywhere*, and they're so inexpensive that you can have a backup practically for peanuts.
I don't agree about ASUS boards though. They're alright, but their model life cycle is WAY too fast. They have almost 100 different boards just for Socket 775! At Linear Acoustic we've had good experiences with MSI boards. Nice, stable, not expensive.
Oh, speaking of LinAc -- Goran made a reference to the I/O connectivity on the 8585.1 as being unachievable with a PC motherboard. Not so -- we've used PC motherboards for years, with completely custom case and I/O boards. We still retain the huge advantage of being able to develop on x86 (development cycles of days, not months), while still being able to offer rock solid hardware to customers.
People do resist change. It takes a dramatic improvement for people to stray from the beaten path. No sense in sticking your neck out if there's no benefit. Well, if you're looking for good sound, and you're ready to take the plunge, look no further than
http://claessonedwards.com
Best,
///Leif