Synology DVA3221 4-Bay 32 Channel Diskless NVR, CPU Intel Atom CS3538 Quad-Core 2.1GHz, GPU NVIDIA GeForce GTX 1650, Memory 8GB DDR4 non-ECC SO-DIMM (2x 4GB, expandable up to 32GB, 2 Slots), Compatible Drive 4x 3.5" or 2.5" SATA/SSD (Drives not included), External Ports 3x USB 3.2 Gen1, 2x eSATA, 1x COM, Hot-swappable. The DVA3221 from Synology is a 4-bay desktop NVR surveillance solution that supports up to 32 IP channels (8 camera licenses included). This unit's four SATA ports support raw storage up to 64TB.