The three models are the Disk Station DS508, a 5-bay desktop SATA NAS with hot-swappable drives and up to 4TB capacity using 1TB drives, the Rack Station RS408 and Rack Station RS408RP, 4-bay rack-mounted SATA NASes with 1U form factor, hot-swappable drives, and up to 3TB capacity using 1TB drives. The RP has a redundant power supply.
All three products feature "green" designs with 8W CPU power consumption (hard drive power consumption is not included in this figure). The NASes support JBOD and RAID 0, 1 and 5 modes and use Synology's recently-released Disk Station Manager 2.0 NAS management software, which includes video surveillance recording and playback with IP cameras.
The DS508 will ship in June with an MSRP of $1,029.95. The RS408 and RS408RP will ship in July at MSRPs of $1,499.95 and $1,799.95, respectively.