Lenovo ThinkSystem SR655 V3 - Pcie Slots and Pcie Adapters

Memory module installation guideline
• At least one DIMM is required. Install at least six DIMMs for good performance.
• Mixing DIMMs from different vendors is supported in a system.
• Mixing x4 and x8 DIMMs is not allowed in a system.
• Only one rank and two rank DIMM mixing is allowed in a system.
• When installing DIMMs with different capacity, install the DIMM with the highest capacity first.
• For best performance, the population recommends identical memory capacity and rank across all 12
channels.
Memory module installation order
The following table shows the DIMM population sequence.
Table 12. DIMM population sequence
Total DIMMs
CPU
12 11 10 9 8 7 6 5 4 3 2 1
1 DIMM 7
2 DIMMs
7 6
4 DIMMs 9 7 6 4
6 DIMMs 9 8 7 6 5 4
8 DIMMs 11 9 8 7 6 5 4 2
10 DIMMs 11 10 9 8 7 6 5 4 3 2
12 DIMMs 12 11 10 9 8 7 6 5 4 3 2 1
PCIe slots and PCIe adapters
This topic provides installation rules for PCIe adapters.
Slot configurations
The following tables list the PCIe slot configurations for each server rear view.
Server rear view PCIe slots
Slots 1–3 on riser 1: x16/x8/x8 Slots 4–6 on riser 2: x16/x8/x8
Supported PCIe adapters and slot priorities
The following table lists the recommended slot installation priority for common PCIe adapters.
PCIe adapter
Maximum
supported
Suggested slot priority
Internal SFF RAID/HBA adapter
940-8i, 940-16i
1
• slot: 2, 3, 5, 6
40 ThinkSystem SR655 V3 User Guide