Hi Dear All Buyers I'm selling this NAS with upgraded to 2GB RAM. This Qnap able to upgrade to 4GB RAM MAX with DDR2 SODIMM 4GB, I have upgraded my QNAP already. so that's why I'm selling this Qnap. TS-459 Pro+ houses up to four 3.5-inch or 2.5-inch SATA hard disk drives, incorporates Intel Atom D525 1.8GHz dual core processor and 2GB memory, and is capable of delivering ultra high performance, reliability, and lower power consumption during intensive data transfers. The NAS is an efficient and powerful business storage center with advanced iSCSI services, cross-platform data sharing, and all-in-one server applications. With VMware Ready and Citrix Ready certification, and proven compatibility with Microsoft Hyper-V environment, the NAS is an ideal shared storage solution in the virtualized and clustered environment.