Synology DS1621+ QC2,2GhzCPU/4GbDDR4(upto32)/RAID0,1,10,5,6/upto 6hot plug HDD SATA(3,5' or 2,5')(upto16 with 2xDX517)+2 M.2 slots 2280/3xUSB3.2/4GigE(+1Expslot)/iSCSI/2xIPcam(upto40)/1xPS