QNAP TS-421 & QTS 4.0 @ techPowerUp
 

QNAP recently released a major upgrade of their operating system, the QTS 4.0, and they were kind enough to send us a 4-bay NAS for testing, the TS-421, which comes with their latest operating system pre-installed. The TS-421 is a mid-level NAS best suited to home and SOHO environments.

http://www.techpowerup.com/reviews/QNAP/TS-421/