Here's the latest hardware requirements for 9.x
http://www.freenas.org/hardware-requirements/
-Jeremy
NOTE: THE INFORMATION IN THIS POST IS FOR FREENAS 8.0.* AND IS NO LONGER CONSIDERED UP-TO-DATE. HOWEVER, THERE'S STILL LOTS OF GOOD TIDBITS HERE. -jgreco
First, if you plan to use ZFS, the official recommended minimum RAM is 6GB. You can get by with 4GB, but any less and it may not be stable. If you don't plan to use ZFS, 2GB is the absolute minimum, but some people have used less, again it may cause your system to have unpredictable stability.
The 'Official' FreeBSD hardware list is HERE, however to reduce FreeNAS's footprint, not all drivers are included in FreeNAS. The FreeNAS Hardware Requirements are here: http://doc.freenas.org/index.php/Hardware_Requirements
A forum thread was started to get people that had FreeNAS 8.x running and to list their hardware as a reference for people to see what is working that may not be in the official list here. Also here is a Build Guide that @dgoodlad wrote up that offers a some good info.
If I can get more people to contribute to that thread, I'll try and consolidate a list here and break it up into categories. Scroll down or click link.
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