Precision 7920 Workstation Desktop Tower with Xeon ...
2 PCIe x16 2 Additional x16 slots with 2nd CPU 1 PCIe x8 open ended 1 x16 wired as x 4 1 x16 wired as x1 Up to 4 PCIe slots in PCIe enabled chassis for M.2 and U.2 (future) PCIe SSDs.
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Slots: Up to 2 PCIe Gen4 slots. ... 1TB HP Z Turbo PCIe 4x4 M.2 TLC SSD.
Internal Dual Slot Hard Disk Case 2.5+3.5 inch SATA HDD ...
Five SATA 3 slots PCIe. One PCIe x16 Gen5 (discrete graphics card only) One PCIe x4 Gen4 Specifications of Precision 3660 Tower 15. Table 8. Internal slots ...