Table 1. Server specifications (continued)
Specification
Description
Memory
• Slots: 32 memory module slots
• Supported memory module type:
– TruDDR4 3200, dual-rank, 16 GB/32 GB/64 GB RDIMM
– TruDDR4 3200, dual-rank, 128 GB 3DS RDIMM
• Minimum memory:
– 16 GB using RDIMMs
– 128 GB using 3DS RDIMMs
• Maximum memory:
– 2 TB using RDIMMs
– 4 TB using 3DS RDIMMs
Note: The operating speed and total memory capacity depend on the processor
model and UEFI settings.
For a list of supported memory, see the Lenovo ServerProven Web site:
https://static.lenovo.com/us/en/serverproven/index.shtml.
For technical rules for memory modules, see Technical rules for DIMMs.
Internal drives Front:
• Up to ten 2.5-inch hot-swap SAS/SATA/U.2 drives
• Up to four 3.5-inch hot-swap SAS/SATA/NVMe drives
Inside:
• Up to two internal SATA/NVMe M.2 drives
Rear:
• Up to two 2.5-inch hot-swap SAS drives
• Up to two 7mm hot-swap SATA/NVMe drives
For technical rules for drives, see Drive bay configurations and requirements.
Expansion slots
Depending on the model, your server supports up to three PCIe slots in the rear.
• PCIe x16, low-profile
• PCIe x16/x16, low-profile + low profile
• PCIe x16/x16, low profile + full-height
For locations and technical rules for PCIe slots, see Rear view and Technical rules for
PCIe adapters.
Graphics processing unit
(GPU)
Your server supports the following GPUs:
• Low-profile, half-length, single-wide: NVIDIA® Quadro® P620, NVIDIA® Tesla® T4
• Full-height, half-length, single-wide: NVIDIA® Quadro® P2200
For technical rules for GPU, see Technical rules for GPU adapters.
4 ThinkSystem SR645 Maintenance Manual
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