Key features quad core cpu delivers 44666 mbs reading 42512 mbs writing four gigabit lan ports with failover and link aggregation support scale up to 15 drives with synology dx513 expandable ram module up to 6gb high availability and ssd readwrite cache support ultra performance nas optimized for intensive tasks and encryption featuring a quad core processor hardware encryption engine and flawless software integration ds1515 is a powerful expandable 5 bay nas server that delivers