Synology DiskStation 5-Bay (Diskless) Scalable Network Attached Storage DS1511+ (Black) Expandable RAM Size (up to 3GB) Scale up to 15 Drives with Synology DX510 Windows ADS and ACL support 165.91 MB/sec Writing, 197.8 MB/sec Reading with LAG iSCSI Targets for Virtual Storage Solution 165.91 MB/sec Writing, 197.8 MB/sec Reading with LAG Windows ADS and ACL support iSCSI Targets for Virtual Storage Solution Scale up to 15 Drives with Synology DX510 Expandable RAM Size (up to 3GB)