The new TS-x31+ series uses the dual-core ARM Cortex-A15 processor and 1 GB DDR3 RAM while able to accommodate two or four 2.5-inch drives, thus offering excellent value to small and home office users.
http://www.notebookcheck.net/QNAP-announces-TS-x31-series-Turbo-NAS.134996.0.html