I've been running the ACID install on my system for several months now, using 2 converted USB fobs. However, I was using a system I originally put together to be used as a Linux workstation with a 2.6 GHz Core 2 Duo processor. Quite a bit of overkill for an Asterisk node. 
Also, I wanted to run my node(s) on an embedded system with minimal moving parts, so I built another system running Limey Linux. Used a 256 MB CF card, 1.3 GHz Celeron processor and 512 MB RAM. This runs quite nicely using about 25% CPU when playing newsline through the USB connected systems and listen through a connected cellphone.
Guess for my next project, get chan_rtpdir running with Limey Linux based system.
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Randy Hammock KC6HUR
http://kc6hur.net/~rhammock/
http://irlp.kc6hur.net/
If there are no horses in heaven, then when I die, I want to go where they went.