PCIe riser and adapter installation rules and order (server model with three PCIe risers)
Use the information in this topic to understand installation rules and order for PCIe risers and PCIe adapters in the sever with three PCIe risers.
Note
- Performance may degrade when a x16 PCIe card is installed in a x8 lane PCIe slot.
- The available PCIe slots will depend on the riser and number of processors installed.
- With two processors installed: PCIe slot 3, 5, 9, and 11.
- With four processors installed: PCIe slot 3 to 11.
- PCIe slot 3 and 4 are unavailable when a rear M.2 drive cage is installed.
- PCIe slot 3 and 9 are unavailable when a two-slot PCIe Gen5 riser card is installed.
- PCIe slot 8 is unavailable when a serial port kit is installed.
PCIe riser installation rules and order
| Installation priority | PCIe riser type | Riser location priority |
|---|---|---|
| 1 | Two-slot riser with rear M.2 drive bays | Riser 1 |
| 2 | Two-slot riser (x16/x16) | Riser 1, riser 3 |
| 3 | Three-slot riser (with power connector) | Riser 1, riser 3 |
| 4 | Two-slot riser (x8/x8) | Riser 1, riser 3 |
| 5 | Three-slot riser (without power connector) | Riser 2 |
PCIe adapter installation rules and order
| Installation priority | Component | PCIe slot priority |
|---|---|---|
| 1 |
|
|
| 2 | ThinkSystem NVIDIA ConnectX-7 NDR400 OSFP 1-Port PCIe Gen5 Adapter | 5, 11, 10, 4, 6 |
| 3 | Double-wide GPU | 10, 4 |
| 4 | Single-wide GPU | 10, 4, 3, 9 |
| 5 |
| 5, 11, 10, 4, 6 |
| 6 |
| 5, 11, 10, 4 |
| 7 |
| 5, 11, 8, 7, 10, 4, 6, 9, 3 |
| 8 | External HBA adapter | 5, 11, 8, 7, 10, 4 |
| 9 | OCP module | 1, 2 |
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