LEN ThinkStation P520 Intel Xeon W-2135, Intel vPro, PCIe SSD Storage, NVIDIA P1000 Graphics Card, W10P 64, 4 Yr On-site Warranty, 4 Yr Accidental Damage, 4 Yr Premier Support (32GB, 512GB SSD)

Bays 2x 3.5" disk bay (standard) 4x 3.5" disk bay (optional): 2 bays come with 3rd disk or Storage Bay Upgrade Kit 2 bays via flex bay Flex Bays 2x flex bays, supports the following: 2x half-height optical drives 2x 5.25" 9.0mm optical drives 1x 5.25" 9.0mm optical drive + 2x 3.5"/2.5" SATA SSD/HDD 1x 3.5"/2.5" SATA SSD/HDD with Front Access Storage Enclosure 1x flex module for the following options: Tray 1: 9.0mm optical Tray 2: 15-in-1 USB 3.1 Gen 1 reader, 2x Thunderbolt, or 4-digit diagnostic display Port 1 and 2: Front USB 3.1 Gen 1 Type-C or eSATA 2x M.2 SSD with 2x Front Removable Drive Enclosures M.2 Slots Up to 9x M.2 SSD: 2 via onboard slots 4 via Quad M.2 to PCIe adapter 3 via Single M.2 to PCIe adapter Expansion Slots One PCI Two PCIe 3.0 x4 One PCIe 3.0 x8 Two PCIe 3.0 x16 Expansion Slots Offering Slot 1: PCIe 3.0 x8, full height, full length, 25W, open ended, by CPU Slot 2: PCIe 3.0 x16, full height, full length, 75W, double-width, by CPU Slot 3: PCIe 3.0 x4, full height, half length, 25W, open ended, by PCH Slot 4: PCIe 3.0 x16, full height, full length, 75W, double-width, by CPU Slot 5: PCI, full height, full length, 25W Slot 6: PCIe 3.0 x4, full height, half length, 25W, open ended, by PCH