Synology (Rack3U) RS4021xs+ 8C2,1Ghz/16Gb (64)/RAID0,1,10,5,6/upto16HP HDDs SATA(3,5'or2,5')upto 40 with 2xRX1217(RP)/2xUSB/4xGE+2x10GE/2xPCIe/iSCSI/2xIPcam(upto90)/2xRPS/no rail/5YW' repl RS4017xs+