NOTE: this post is now pretty outdated, please see here for a current list of recommended controllers and related discussion.
Many unRAID servers use one or more SATA controller cards expand the number of SATA connections a motherboard can support. Some of these cards have a few special settings or tricks needed to get them working properly.
8 Port Cards
Supermicro AOC-SASLP-MV8
Requirements: PCIe x4 or faster slot (PCIe x16 works fi