QNAP TS-531P Quad-core Business-class NAS Review
 

Despite the fact that we are dealing with a NAS server designed for low-power consumption, it is able to deliver good performances in both regular and encrypted volume scenarios, comes with memory upgrade possibilities up to 16GB, 10GbE expansion slot, can scale up to 21 drives with QNAP UX-800P enclosures and more. The Quad-LAN support helps when having a LAG configuration, for failsafe or for connecting the server to different networks and the SSD acceleration function can boost the product when using IOPS-demanding applications.

http://www.madshrimps.be/articles/article/1000868