QNAP Tower Model 1. TS-473A-8G 2. TS-673-4G 3. TS-h973AX-32G 4. TS-873-4G 5. TS-H686-D1602-8G 6. TS-H886-D1622-16G 7. TVS-873e-4G 8. TS-451D2-2G 9. TVS-h1288X-W1250-16G